Electric Service Handbook June 2021
Non-residential Projects Permanent and Temporary Service ©2021 by Puget Sound Energy All rights reserved. No part of this book may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or information storage and retrieval system, without permission from Puget Sound Energy (PSE).
Electric Service Handbook 2021 — Non-residential Projects Customer service—guaranteed
PSE makes two service guarantees to you. First, we commit to keeping scheduled appointments, and second, we commit to restoring power outages as soon as we can. • If we don’t keep an appointment to install new service, reconnect existing service, or inspect natural gas equipment, you’ll receive a $50 credit on your PSE bill. • If your electric service is out for 120 consecutive hours or longer, you may be eligible to receive a $50 credit on your PSE bill. These service guarantees are in addition to nine service quality measures that track PSE’s performance, and are subject to certain conditions and may be suspended during unusual and exceptional circumstances. For more information, visit pse.com/guarantees.
Electric Service Handbook 2021 — Non-residential Projects Table of contents
Preface What this handbook contains ...... 1 PSE’s service availability...... 1 Electrical service equipment inspection...... 1 Codes and jurisdictions ...... 1 Scheduling...... 2 Other electric service information...... 2 How to contact Puget Sound Energy...... 2 PSE’s service providers ...... 2 Overview: new permanent and temporary electric service hookup...... 3
Chapter 1 Steps to a smooth permanent service installation
The installation process ...... 4 Setting up an account ...... 4 Submitting an application for service...... 4 Service voltages...... 5 Know what’s below: Call 811 before you dig...... 5 Cost for service ...... 6 Additional service costs ...... 6 Voltage flicker and size of transformer...... 6 Voltage drop calculations ...... 6
Chapter 2 Permanent underground services
Service equipment installation responsibilities...... 7 Puget Sound Energy...... 7 Customer...... 7 Preparing for your service hookup ...... 7 Cable limits for transformers...... 8 Customer-provided trenches ...... 9 Trench width for PSE facilities...... 9 Trench routing/clearances...... 9 Trench excavating requirements for PSE facilities...... 11 Trench and backfill requirements for primary electric line extension trenches (no PSE gas). .11 Trench and backfill requirements for primary electric line extension trenches (with PSE gas)...... 12 Vault excavation requirements ...... 12
Electric Service Handbook 2021 — Non-residential Projects Table of contents
Conduit installed at vaults...... 13 Attaching a customer’s service line to a power pole...... 16 When the power pole is on private property ...... 16 When the power pole is in a city/county/state right-of-way...... 16 Racking of cable in vaults...... 18 Cable ladder...... 18 Cable supports...... 18 Cable training and identification...... 18 Customer wiring to energized PSE transformers...... 20 Single-phase minipad transformers...... 20 Three-phase padmount transformers ...... 20 Transformer locations...... 21 Landscaping and other obstacles...... 24 Working space...... 24 Guard posts for padmount and subsurface equipment...... 25 Approved guard posts...... 26 Fault current levels...... 27
Chapter 3 Permanent overhead services
Service equipment installation responsibilities...... 29 Puget Sound Energy...... 29 Customer...... 29 Preparing for your service hookup ...... 29 Service mast requirements...... 30 Height requirements ...... 30 Clearances from gas meters...... 30 Additional mast supports...... 30 Screw-in service knobs...... 30 Installing the service equipment ...... 31 List of customer-provided service entrance equipment ...... 31 Terrain considerations for meter base/socket locations...... 31 Customer-owned meter pole ...... 31 Meter pole requirements...... 31 Meter pole locations...... 31 Meter pole installation...... 31
Electric Service Handbook 2021 — Non-residential Projects Table of contents
Chapter 4 Meter installation
Other contacts...... 33
Section 1: General metering requirements Metering equipment responsibilities ...... 33 Puget Sound Energy...... 33 Customer...... 34 Other customer responsibilities...... 34 Installing or removing meters by a qualified electrician...... 34 Inspections and approvals...... 34 Sealing provisions on enclosures...... 34 Service conductors...... 34 Grounding...... 34 Labeling ...... 35 Customer equipment ...... 35 Current-limiting fuses...... 35 Meter locations...... 35 Location requirements...... 35 Prohibited locations...... 35 Meter location requirements for manufactured commercial structures (school portables, industrial modular office, etc.)...... 36 Electrical room requirements...... 36 Electrical room locations in high-rise buildings ...... 38 Meter bases/sockets ...... 38 General requirements ...... 38 Determining meter base/socket type...... 38 Meter base/socket clearances...... 39 Remote metering...... 41 Meter pedestal requirements for remote metering...... 42 Meter pedestal location...... 42 Remote service requirements based on service ampacity...... 42 Multiple meter installations...... 43 Multifamily...... 43 Nonresidential...... 44 Multiple meter base/socket labeling...... 44
Section 2: Self-contained metering requirements Single-phase services: 400 A or less and three-phase services: 200 A or less Meter base/socket main disconnect combinations...... 45 Manual block bypass requirements...... 45 Disconnecting means and its sequence ...... 45 Safety sockets ...... 45
Electric Service Handbook 2021 — Non-residential Projects Table of contents
Load balancing...... 45 Service conductor connections ...... 45 Self-contained meter base/socket requirements...... 48 Single-phase services: 400 A or less...... 48 Single-phase services: 120/240 V, 200 A or less...... 48 Single-phase services: 201 to 400 A...... 48 Single-phase services: 120/208 V, 200 A or less...... 48 Single-phase streetlight services: 120/240 V or 240/480 V pedestals...... 48 Meter/panel combo units ...... 48 Three-phase services: 200 A or less...... 49 All three-phase services ...... 49 Three-phase services: 120/240 V, four-wire delta (Restricted — available only for existing services) ...... 49 Three-phase services: 277/480 V...... 49
Section 3: Current transformer (CT) metering requirements (up to 800 A) Single-phase services: Over 400 A and three-phase services: over 200 A Puget Sound Energy’s installation responsibilities...... 51 Customer’s installation responsibilities ...... 51 Meter base/socket ...... 51 Sequencing...... 51 Metering circuit conduit...... 51 Approval drawings required...... 51 Location requirements...... 51 CT enclosure...... 52 Mounting the CT...... 53 Customer requirements for switchboard metering (over 800 A)...... 56 Approval drawings required...... 56 Installing current transformers...... 56 Three-phase services ...... 56
Chapter 5 Customer generation
Responsibilities...... 57 Puget Sound Energy...... 57 Customer...... 57 General requirements...... 57 What to submit when applying for interconnection...... 57 Interconnection system diagrams...... 58 Meter location...... 58 Meter socket requirements...... 58
Electric Service Handbook 2021 — Non-residential Projects Table of contents
Labeling requirements ...... 59 Disconnect switch requirements...... 59 Commissioning...... 60 Resources ...... 60
Chapter 6 Temporary services
What this chapter contains...... 61 Three-phase temporary service...... 61 Definition ...... 61 Obtaining your temporary service from existing power facilities...... 61 Scheduling...... 62 Customer charge for service...... 62 Temporary meter base/socket requirements...... 62 Temporary underground services...... 62 Meter location...... 63 Trenching and excavation requirements...... 63 Underground temporary service installation process...... 64 Temporary overhead services...... 66 Meter location...... 66 Service line path requirements...... 66 Clearance requirements ...... 66 Overhead temporary service installation process...... 67
Glossary...... 69
List of tables Table 1 Service voltages available from PSE...... 5 Table 2 Color codes for locating utilities...... 5 Table 3 Maximum cable runs per transformer...... 8 Table 4 Clearances for padmount transformers...... 21 Table 5 Maximum short circuit current (in amps) for single-phase transformers, padmounted. . . 27 Table 6 Maximum short circuit current (in amps) for three-phase transformers, padmounted. . 27 Table 7 Maximum short circuit current (in amps) for Y-Y grounded transformers...... 28 Table 8 Single-phase (nonresidential only) and all three-phase meter base/socket types . . . .50 Table 9 CT enclosure dimensions (minimum)...... 53
List of figures Figure 1 Typical joint utility trench with primary voltage cable on your private property. . . . . 10 Figure 2 Location of customer conduit in PSE vaults...... 13
Electric Service Handbook 2021 — Non-residential Projects Table of contents
Figure 3 Minimum dimensions and excavation requirements for small, secondary connection handholes...... 14 Figure 4 Minimum dimensions and excavation requirements for a single-phase padmount transformer vault...... 15 Figure 5 Minimum dimensions and excavation requirements for a three-phase padmount transformer vault, 300 kVA or less ...... 15 Figure 6 PVC conduit riser placement when pole is on private property only...... 17 Figure 7 PSE-installed underground connection handhole...... 18 Figure 8 Minimum dimensions and excavation requirements for a three-phase padmount transformer vault, 500 kVA and larger...... 19 Figure 9 Racking of cable in vaults ...... 19 Figure 10 Clearances for transformers from structures ...... 22 Figure 11 Clearances for transformers...... 23 Figure 12 Minimum clearances from oil-filled equipment to LP, hazardous liquid, or fuel tanks. . .23 Figure 13 Plan view of subsurface equipment clear working space...... 24 Figure 14 Plan view of padmount equipment clear working space...... 25 Figure 15 Guard post location requirements...... 25 Figure 16 Typical guard posts...... 26 Figure 17 Minimum clearance requirements upon installation ...... 30 Figure 18 Permanent overhead meter pole installation...... 32 Figure 19 Typical 8 in. x 8 in. x 6 in. exterior wall-mounted AMR/AMI antenna installations . . . .37 Figure 20 Meter base/socket minimum clearances, without switchgear...... 40 Figure 21 Switchgear installed meter and current transformer minimum clearances ...... 40 Figure 22 Minimum clearances for recessed meters...... 41 Figure 23 Typical factory-built residential multimeter panel for multifamily complex...... 43 Figure 24 Typical multiple nonresidential meter installations for services 200 A or less...... 44 Figure 25 Typical safety socket...... 46 Figure 26 Typical arrangement of service conductors for underground commercial single-phase 320 A service...... 46 Figure 27 Typical arrangement of service conductors for overhead commercial single-phase 320 A service...... 47 Figure 28 Typical arrangement of service conductors for 120/208 V three-phase self-contained 200 A service...... 47 Figure 29 Preferred method of conduit installation in a single-phase and three-phase CT enclosure...... 52 Figure 30 Single-phase CT mounting base bracket. EUSERC 328A or 328B ...... 54 Figure 31 Three-phase CT mounting base bracket. EUSERC 329A or 329B...... 55 Figure 32 Options for switchboard meters ...... 56 Figure 33 Instrument-rated CT meter bases/sockets...... 56 Figure 34 Trenching requirements for power stubout ...... 63 Figure 35 Temporary underground service installation...... 65 Figure 36 Minimum clearance requirements upon installation ...... 67 Figure 37 Temporary overhead service installation...... 68
Electric Service Handbook 2021 — Non-residential Projects Preface
This handbook is your guide to Puget Sound Energy’s (PSE) requirements for new electric service installations of less than 600 volts for commercial, industrial, multifamily, and nonresidential applications. This handbook provides most, but not all, of the information and requirements that you will need. It does not include all possible standards and specifications required by PSE, state, federal, or local code requirements. If you need additional information, please call PSE Customer Construction Services (CCS) at 1-888-321-7779, your local government agency, or state inspector.
What this handbook contains This handbook contains information on service installations for: • Commercial and industrial buildings • Apartment complexes • Community wells • Condominium complexes • Barns and shops If the type of service you need is not addressed in this handbook, please contact PSE’s CCS at 1-888-321-7779. PSE’s service General boundaries for PSE’s gas and electric service areas are available on availability pse.com/construction-services. A CCS Representative can help you to determine the closest available service line and can provide you with cost information for establishing new service.
Electrical service equipment inspection Once your service equipment is installed, the state of Washington or the city with jurisdiction over your area requires that your installation pass an electrical inspection before PSE can connect you to the system. It is your responsibility to request this inspection.
Codes and jurisdictions This handbook shall not be interpreted to conflict with the regulations of the state of Washington or other regulatory bodies having jurisdiction. PSE’s metering requirements may be more stringent. Local codes and requirements related to the planned work should be addressed before any construction begins.
Electric Service Handbook 2021 — Non-residential Projects 1 Preface
Scheduling Engineering, scheduling, and construction of the work will vary depending upon the complexity of the job and the volume of work requested by PSE customers. Contact your CCS Representative at 1-888-321-7779 for current construction scheduling.
Other electric service information Puget Sound Energy’s guides and handbooks are available at the Construction Services Guides and Handbooks web page.
How to contact Puget Sound Energy You can obtain further information by contacting us through the following: • Go to pse.com/construction-services • Or call PSE Customer Construction Services (CCS) at 1-888-321-7779 Monday thru Friday, 7 a.m. − 5 p.m. If you have questions about Energy Efficiency Programs: • Go to pse.com/rebates • Or call PSE Energy Advisors at 1-800-562-1482 Monday thru Friday, 8 a.m. − 5 p.m. If you have general questions regarding your account, such as changing service or questions about your bill: • Go to pse.com/customer-service/help-center/my-account • Or call Customer Service at 1-888-225-5773; TTY 1-800-962-9498 Monday thru Friday, 7:30 a.m. - 6:30 p.m. If you have an emergency or a service delivery issue, please call: • Customer Service at 1-888-225-5773; TTY 1-800-962-9498 24 hours a day, 7 days a week.
PSE’s service providers PSE contracts with two partner companies to provide construction services: Potelco, Inc. and InfraSource Construction LLC. The employees who install your service may work for these service providers on PSE’s behalf.
Electric Service Handbook 2021 — Non-residential Projects 2 Preface
Overview: new permanent and temporary electric service hookup
This information applies only if PSE has existing power facilities in your area. If electric power is not readily available, please contact: Customer Construction Services 1-888-321-7779 or pse.com/construction-services.
Commercial/ • Determine if you need overhead or underground service. industrial and • Contact PSE to establish an account, and order your service. multifamily projects • Obtain an electrical work permit. customer • Determine the service rating you want (for example, 200 A or 400 A). responsibilities • Determine an approved meter location. • Notify other utilities of your project. • Ensure that existing underground utilities are located before you dig. Call 811 at least two business days before you dig. • Prepare job site by providing a clear path/trench for your service line for proper vault entrance requirements per PSE standards. • Obtain an approved electrical inspection. • After the electrical inspection has been completed and approved, request that PSE install and energize your system.
PSE’s • Determine if engineering is required. responsibilities • Install your overhead or underground permanent service line conductors. • Install your meter and energize your system.
Scheduling/ • If engineering is not required, services are typically installed and energized time frame 3 to 5 days after you have passed your inspection. Engineering, right-of-way permits, etc., can extend time by 8 weeks or more.
Service charge • Charges vary due to the type of service you request and the type of system we have in your area. Contact your CCS Representative for current rate information.
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Steps to a smooth permanent service installation
The installation process Before a permanent service is energized, you are required to complete the following: • Establish an account with PSE by calling Customer Construction Services (CCS) at 1-888-321-7779. • Determine the type of service needed and if that service will be underground or overhead. • Install required service equipment and underground service cable (if applicable). • Obtain an electrical inspection. • Call PSE and request that your service be energized.
Setting up an account Before PSE can provide new service, you must establish an account. Simply call CCS at 1-888-321-7779. They will request billing information and the address for the new service from you. If you wish, we can initiate your temporary service order at the same time.
Submitting an application for service Call Customer Construction Services (CCS) at 1-888-321-7779 and submit Electric Service Application Permanent Non-Residential 201E or Electric Service Multi-Family Development 400E. All forms can be downloaded at pse.com/construction-services. When you fill out the application, make sure that it is as complete as possible, and include a copy of each of the following items (if applicable) with the application: • Legal description of the property • Title insurance policy, recorded warranty deed, or real estate contract • Site plan • Landscaping plan • Water main plan • Sewer main and profile plans • Road and storm drainage plan • Road cross-section plan • Streetlight requirements NOTE: Several of the above plans may be included in one CAD and Civil drawing.
Electric Service Handbook 2021 — Non-residential Projects 4 Chapter 1
Service voltages We offer the following standard voltages for nonresidential customers: Table 1 Service voltages available from PSE
Service type Voltage 120/208 V, 3-wire * Single-phase 120/240 V, 3-wire ** 120/208 V, 4-wire Three-phase 277/480 V, 4-wire
* Available only if 120/208 secondary voltage exists at the location at the time you apply for service. ** Available for loads up to a maximum demand of 100 kW.
Know what’s below: Call 811 before you dig Before excavating, Washington law requires you to call 811 to locate underground utility lines. Doing so will enable you to avoid potential injury, fines, costly repair of PSE utility facilities, and electric or natural gas service disruptions. Call 811 a minimum of two full business days prior to digging. (For example, call Wednesday to dig on Monday.) When you call, an operator will record information about your dig and notify affected utility companies, including PSE. PSE locates and marks its own lines for free, but privately owned utility lines must be located by a separate vendor, typically for a fee. The locate service uses the following color codes to identify underground utilities:
Table 2 Color codes for locating utilities
Color Utility White Proposed excavation area Pink Temporary survey markings Red Electric power lines, cables, conduit, and lighting cables Yellow Natural gas, oil, steam, petroleum, or gaseous materials Orange Communication, alarm or signal lines, cables, or conduit Blue Potable water Purple Reclaimed water, irrigation, and slurry lines Green Sewers and drain lines
NOTE: Use white paint to mark the area within which you want utility locations. Once all utilities are located: • Do not dig with machinery within 3 feet of the locate marks. • Hand dig to expose all utilities to be crossed.
Electric Service Handbook 2021 — Non-residential Projects 5 Chapter 1
Cost for service Contact your CCS Representative or PSE Project Manager to determine the cost for service.
Additional service costs
Voltage flicker Commercial/industrial customers—If the system will serve a facility that is purposely and size of built to serve a single specific customer, and that customer will operate the facility transformer and is knowledgeable about flicker, then the system shall be designed to deliver no more than 3 percent voltage flicker at the point of service. Multifamily customers—If a transformer is built to serve multiple customers, a maximum of 3 percent or less is specified at the point of service. This is common to all customers. In your Application for Service, you must provide PSE with the locked rotor starting currents for the largest single-phase and three-phase motors. After we determine the size of transformer required to serve the new load of the facility, we will calculate the percent voltage flicker (from the motor’s starting current) at the point of service and provide that number to you. If this voltage dip exceeds PSE’s limits based on facility type, the transformer size must be increased to compensate for this. You will be responsible for the difference in cost of the larger transformer, or you will need to install sufficient controls to bring flicker back within PSE’s limits. NOTE: We will size PSE’s facilities to provide a level of voltage flicker that is normally acceptable to customers. If you need to be served with a higher quality of service, contact your CCS Representative or PSE Project Manager.
Voltage drop You are responsible for calculating the overall voltage drop to your facility and calculations determining what is an acceptable level for your facility. If you determine that the voltage drop is unacceptable, you must determine a solution. Some possible solutions are: • Run separate services from PSE’s transformer for motor loads. • Modify or upgrade your equipment or underground service cables (if applicable). • Pay PSE to increase the size of our transformer. • Pay PSE to provide a second transformer.
Electric Service Handbook 2021 — Non-residential Projects 6 Chapter 2
Permanent underground services
This chapter provides you with information on PSE’s underground service installation. Please follow these requirements to avoid a delay in your service hookup. If you have any questions about this information, call Customer Construction Services (CCS) at 1-888-321-7779.
Service equipment installation responsibilities
Puget Sound PSE is responsible for furnishing, installing, and maintaining the primary voltage Energy system equipment. This equipment includes primary conduit and cables, service conductor connectors at the transformer, current transformers (CT), meter(s), and meter wiring.
Customer You are responsible for furnishing, installing, and maintaining all required service entrance equipment, including the service entrance conduits* from the meter socket or current transformer enclosure to PSE’s designated point of delivery. For services where current transformers are required, you will also need to run gray electrical conduit from the CT enclosure to the meter base. Refer to Chapter 4, Section 3, Current Transformer (CT) Metering (up to 800 amps) for more information. NOTE: PSE will supply, install, and maintain the CTs and meter wiring. * DO NOT run a grounding wire to PSE’s point of connection at the transformer or handhole. PSE will not connect it.
Preparing for your service hookup The following list will help you prepare your project for the installation of an underground service. After you complete these items, PSE will connect your service and install the metering equipment. 1. Check for any local ordinances/covenants that may prevent you from obtaining an underground service. 2. Complete Electric Service Application Permanent Non-Residential 201E or Electric Service Multi-Family Development 400E. 3. Supply site drawings and load information to your CCS Representative (refer to the submitting an application for service section in Chapter 1, Steps to a Smooth Permanent Service Installation). 4. Contact CCS to determine where your underground service will originate. 5. Determine an approved meter location (refer to the meter locations section in Chapter 4, General Metering Requirements).
Electric Service Handbook 2021 — Non-residential Projects 7 Chapter 2
6. If required by CCS, provide an easement for any permanently installed PSE equipment located on your property. 7. Provide payment for any preconstruction costs determined by your CCS Representative. 8. Provide all excavation for PSE’s facilities and get an approval for the proper vault entrance location of your conductor/conduit. 9. Provide service conductors. 10. Install required service entrance equipment. 11. Connect the meter sockets and permanently label them to indicate the part of the premises they serve, such as unit number. 12. Obtain an approved electrical inspection. 13. Call CCS at 1-888-321-7779 to initiate a connection and energize your new service.
Cable limits for transformers The maximum number of secondary conductors allowed for a specific transformer size is limited to those listed below in Table 3.
Table 3 Maximum cable runs per transformer Transformer Size and Voltage Maximum secondary cable (PSE-provided) connections (Customer-provided) * 45 thru 300 kVA, 12 Runs #2 − 500 mcm OR 120/208 V secondary 10 Runs 501 − 750 mcm 45 thru 300 kVA, 12 Runs #2 - 500 mcm OR 277/480 V secondary 10 Runs 501 - 750 mcm 500 thru 750 kVA, 18 Runs #2 − 500 mcm OR 120/208 V secondary 14 Runs 501 − 750 mcm 500 thru 750 kVA, 12 Runs #2 - 500 mcm OR 277/480 V secondary 10 Runs 501 - 750 mcm 1000 kVA, 24 Runs #2 − 500 mcm OR 120/208 V secondary 18 Runs 501 − 750 mcm 1000 kVA, 18 Runs #2 - 500 mcm OR 277/480 V secondary 14 Runs 501 - 750 mcm 1500 thru 2500 kVA, 24 Runs #2 - 500 mcm OR 277/480 V secondary 18 Runs 501 - 750 mcm
* These are maximum allowed per the transformer size and voltage, however, the sizing of the vault and training of the cable might reduce these runs. The availability of open position shall be verified. Contact your CCS representative or Project manager for your specific requirements.
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Customer-provided trenches
Trench width The minimum trench width is 18 inches; however, the excavator may need to for PSE increase the trench width depending on the other conduits/lines being installed in the facilities trench. When increasing the trench width, remember to allow a minimum of 12 inches of horizontal separation between PSE’s electrical conduits/cables and gas lines. PSE will allow customer-owned facilities within an electric power trench, if the following minimum horizontal clearances from PSE facilities are maintained: • 18 inches minimum for customer-owned tight-line sewer (not tile), natural gas lines, propane gas lines, fuel oil lines, and water mains up to 6 inches in diameter. • 12 inches minimum for water service, irrigation pipes, lighting, security and electric supply circuits, communications lines, culverts, and closed system roof drains/storm drains (not French drains). NOTE: When constrained by obstructions or clearances from other buried utility lines/facilities, the horizontal clearance between PSE power and communications may be reduced to 4 inches with mutual agreement from the participating communications providers. It is your responsibility to obtain agreement from participating communications providers for a reduced clearance when needed. Figure 1 illustrates PSE’s width and depth requirements for primary cable voltage line extension trenches on private property with and without a gas line present. For trenching requirements with a gas line present, refer to the Joint Utility Mainline Trench Excavation Requirements.
Trench routing/ The routing of a customer-provided trench must maintain a minimum of 5 feet from clearances septic tanks and a minimum of 10 feet from drain fields.
Electric Service Handbook 2021 — Non-residential Projects 9 Chapter 2
Figure 1 Typical joint utility trench with primary voltage cable on your private property (cross-section view)
PRIMARY POWER CABLE PRIMARY POWER CABLE DIRECT BURIED OR DB120 CONDUIT INSTALLATION SCHEDULE 40 CONDUIT INSTALLATION
ROADSIDE 18" 24" MIN 18" ROADSIDE 24" MIN TYPICAL TO EXCAVATED DIRT PILE TYPICAL FINAL GRADE FINAL GRADE TO EXCAVATED DIRT PILE
BACKFILL FOR DB120 36" CONDUIT/DIRECT BURIED 12" MIN CABLE (NO ROCKS OVER 36" MIN SEPARATION COVER 10" DIAMETER) MIN BACKFILL FOR COVER 12" MIN SEPARATION SCHEDULE 40 CONDUIT 48" 48" (NO ROCKS OVER 10" MAX 6" OR 12" OF SAND, 5/8" MINUS, MAX DIAMETER) OR CLEAN BACKFILL SHADING 1
3" OF SAND, 5/8" MINUS, OR CLEAN BACKFILL BEDDING
PHONE & TV PRIMARY POWER CABLE DIRECTLY PHONE & TV PRIMARY POWER CABLE BURIED OR IN PSE-PROVIDED GRAY IN CUSTOMER-PROVIDED DB120 GRADE CONDUIT SCHEDULE 40 CONDUIT
PRIMARY POWER, MAINLINE GAS, AND COMMUNICATIONS
ROADSIDE 32" 24" MIN TYPICAL FINAL GRADE EXCAVATED POWER, GAS, AND COMMUNICATIONS DIRT PILE
24" BACKFILL (NO ROCKS OVER 10" DIAMETER) 36" MIN SEPARATION COVER 48" 12" MIN 12" MIN MAX SEPARATION SEPARATION 6" OR 12" SAND SHADING AFTER COMPACTION 2
4" SAND BEDDING
GAS PRIMARY POWER COMMUNICATIONS CABLES OR CONDUIT
PRIMARY POWER AND MAINLINE GAS 24" MIN EXCAVATED DIRT PILE NOTE 1 SEE TRENCH AND BACKFILL REQUIREMENTS FOR BACKFILL (NO ROCKS OVER 10" DIAMETER) PRIMARY ELECTRIC LINE EXTENSION TRENCHES 12" MIN * (NO PSE GAS) ON PAGE 11. 36" SEPARATION NOTE 2 48" SEE TRENCH AND BACKFILL REQUIREMENTS FOR MAX 6" OR 12" MIN SAND SHADING PRIMARY ELECTRIC LINE EXTENSION TRENCHES AFTER COMPACTION 2 (WITH PSE GAS) ON PAGE 11.
* THE MINIMUM DISTANCE BETWEEN THE 4" SAND BEDDING SURFACES OF TWO UTILITIES, NOT THE CENTERLINE DISTANCE. NATURAL GAS PRIMARY POWER CABLES OR CONDUIT
Electric Service Handbook 2021 — Non-residential Projects 10 Chapter 2
Trench The following requirements for the trench must be met before power conduits/cables excavating will be installed. requirements • When you trench in the right-of-way on PSE’s behalf, the governing jurisdictions for PSE issue public roadway use permits to PSE. PSE requires that you provide a facilities signed Excavation Requirements & Final Grade Certification document that is supplied by your PSE Project Manager. • For trench work provided by you within a public right-of-way or a PSE easement, PSE requires that you use a Washington State licensed and bonded contractor and complete and sign a PSE trenching agreement form. NOTE: Acquiring permits for excavation-related activity can take up to a month or longer depending on the amount of material being excavated, the location of the excavation, and the jurisdiction issuing the permit. To avoid schedule delays, contact your PSE Project Manager for an estimated time frame for acquiring your permits. • The trench shall be excavated according to the trench detail, and PSE’s work sketch. • The trench shall be straight and the trench bottom shall be smooth, level, and free from debris, garbage, sharp objects, or rocks larger than 4 inches. • If PSE cable will be direct buried or in gray DB120 conduit, you must provide at least 3 inches of sand bedding on the bottom of the trench. • Excavated or loose material shall be placed at least 2 feet from the field edge of the trench. • Water shall be removed by pumping or draining. Restrictions: When PSE’s project scope requires the manipulation of an existing primary cable or circuit, customers or third-party contractors shall not uncover and expose existing buried primary voltage power lines or ducts in an energized state. PSE shall coordinate with the customer and service provider for the lines to be de-energized and grounded, or PSE shall provide qualified workers to perform exposure of energized buried lines. These restrictions apply to both direct-buried cables and cables in conduit.
Trench and PSE will not energize its facilities until the backfill is complete. backfill When PSE primary cables are directly buried, or installed in gray DB120 grade requirements conduit, you are responsible for the following: for primary electric line • Providing a minimum 3-inch bedding layer of sand, 5/8-inch minus, or clean extension backfill (with rocks or solid material no larger than 5/8 inch in diameter and no trenches (no sharp objects) placed below cables/conduits. PSE gas) • A 12-inch shading layer of the same material above the directly buried cables or DB120 conduit. • If native backfill is completely free of foreign objects and rocks in excess of 8 inches in diameter, shading with sand, 5/8-inch minus, or clean backfill can be reduced to 6 inches. • The remaining trench shall be backfilled with soil that is free of rocks larger than 10 inches in diameter and foreign objects. When PSE primary cables are installed in gray Schedule 40 grade conduit, you are responsible for the following: • Backfilling the trench with soil that is free of foreign objects and rocks larger than 10 inches in diameter. Bedding and shading of the conduit with sand, clean backfill or select fill as 5/8-inch minus crushed aggregate is not required.
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Trench and You must provide a 12-inch layer of sand above and a 4-inch layer of sand bedding backfill below the utilities before backfilling (see Figure 1). If native backfill is completely free requirements of foreign objects and rocks in excess of 8 inches in diameter, sand shading over for primary utilities can be reduced to 6 inches after compaction. electric line extension You are responsible for the following: trenches (with PSE gas) • Completing backfill as soon as practical after facilities are placed and inspected. • Carefully placing backfill to prevent damage or movement of the cables or conduit. • Cost of damages to PSE facilities caused by improper backfill or compaction. • Relocation costs due to change in grade or alignment.
CAUTION: Do not use a compactor directly over the power conduit(s) until at least 30 inches of backfill is in place so that the compactor will not damage the cables or conduit. Do not penetrate the soil deeper than 3 inches during compaction with a backhoe compactor.
Vault excavation requirements You are responsible for the following: • Excavating the vault or handhole location. The most commonly used vault types and the required excavation dimensions are shown in Figures 3−5. • Removing debris and leveling the bottom of the excavation with a 6-inch base of crushed rock. • Backfilling the excavation to finished grade at 2 inches below the vault top (if in a landscaped area), or backfilling flush with the grade (if in a hard-surfaced area). • Installing a felt joint around the vault top or cover when concrete is poured up to the vault (e.g., when the vault is to be in a sidewalk).
Electric Service Handbook 2021 — Non-residential Projects 12 Chapter 2
Conduit installed at vaults You are responsible for the following: • Grouting around your service conduits that enter into PSE vaults (except for the vault types shown in Figure 4). Conduits may only enter through mousehole openings or knockouts (see Figure 2). • Sealing service entry conduit at PSE’s vault to prevent water from entering into your service panel. • Contacting CCS for entry location approval and procedures prior to extending conduit or conduit bends into existing service vaults. NOTE: Refer to the Customer wiring to energized PSE transformers section of this chapter for the proper procedure for entering a PSE vault.
Figure 2 Location of customer conduit in PSE vaults
CUSTOMER’S SERVICE WIRE CONDUITS MAY ENTER THE VAULT THROUGH MOUSE HOLES OR KNOCKOUTS IN THE UNSHADED AREA. DO NOT ENTER CONDUITS THROUGH STRUCTURAL CONCRETE SURFACES (VAULT WALL).
VAULT WALL DO NOT ENTER THE SAME QUADRANT AS PSE’S PRIMARY CABLE. PSE CONDUIT
KNOCKOUTS
DO NOT ENTER AT AN ANGLE SO THAT THE CABLES ARE DIFFICULT TO TRAIN ALONG THE VAULT WALLS. CUSTOMER WIRE MUST ENTER AND WRAP WITH PSE WIRES.
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Figure 3 Minimum dimensions and excavation requirements for small, secondary connection handholes PLAN VIEW
PSE 233 CONCRETE HANDHOLE
6'
3' - 0" 7'
2"
3' - 8" 2' - 8" SIDE VIEW 3' - 4" 6" CRUSHED ROCK
CUSTOMER’S CONDUIT OR SERVICE CABLE MUST ENTER FROM BENEATH OR THROUGH THE ENDS OF THE HANDHOLE
PSE 3030 CONCRETE HANDHOLE PLAN VIEW
2' - 4" SQUARE DOOR 6'
2' - 0"
6'
OPEN BASE 23-1/2" SQ INSIDE 2" 2' - 6" 2' - 6"
SIDE VIEW
2' - 4" 6" CRUSHED ROCK
CUSTOMER’S CONDUIT OR SERVICE CABLE MUST ENTER FROM BENEATH OR THROUGH THE KNOCK-OUTS OF THE HANDHOLE
Electric Service Handbook 2021 — Non-residential Projects 14 Chapter 2
Figure 4 Minimum dimensions and excavation requirements for a single-phase padmount transformer vault PLAN VIEW SERVICE AND SECONDARY CABLES ENTER EITHER THE BACK, OR THE BACK HALF ON THE SIDE OF A VAULT CUSTOMER
6' - 0"
PSE 3' - 2" STRUT A NO SECONDARY
6' - 0"
2" 4' - 0" 3' - 6" SIDE VIEW 3' - 6" 6" CRUSHED PRIMARY CABLE ENTERS ROCK EITHER THE FRONT, OR THE FRONT HALF ON THE SIDE OF A VAULT
Figure 5 Minimum dimensions and excavation requirements for a three-phase padmount transformer vault, 300 kVA or less
PLAN VIEW
6" CUSTOMER
8' - 0"
PSE NO SECONDARY 3' - 6" 8' - 0"
2"
SIDE VIEW 4' - 4" 4' - 8" 4' - 8" 6" CRUSHED ROCK
NOTE: Refer to Figure 2 for the location of customer conduit entering PSE vaults.
Electric Service Handbook 2021 — Non-residential Projects 15 Chapter 2
Attaching a customer’s service line to a power pole
When the As a commercial customer, you may attach, own, and maintain up to two service power pole conduit risers on a PSE power pole (see Figure 6), when the pole is located on is on private private property. Three or more conduit service risers require an underground property connection handhole (see Figure 7). If no other risers exist on the pole, attach the first 10 feet of the conduit riser(s) in location 3 (see the plan view of Figure 6). For the location of other riser(s), contact your CCS Representative or your Project Manager for approval prior to installation.
NOTE: All installation work performed on the pole above 10 feet from grade shall be done by electric utility crews.
When the When PSE’s power pole is within a governmental right-of-way, PSE will install a power pole secondary handhole on your property to provide a point of service (see Figure 7). is in a city/ Call CCS for coordination and guidance before attaching service conduits to PSE county/state power poles within a governmental right-of-way. right-of-way
Electric Service Handbook 2021 — Non-residential Projects 16 Chapter 2
Figure 6 PVC conduit riser placement when pole is on private property only
PLAN VIEW SIDE VIEW ITEMS IN SHADED AREA INSTALLED BY PSE
DIRECTION OF VEHICULAR TRAFFIC 10
LOCATION LOCATION 1 2 COMMON NEUTRAL
6 7 LOCATION LOCATION 4 3 8 5" MIN
UP TO 2 CONDUITS 20' CONDUIT STANDOFF BRACKET 6 7
CONDUIT CLAMP 15" MIN LENGTH THIS PORTION IS INSTALLED BY PSE
Items provided and installed by customer 9 1 Up to two 15" min. long standoff brackets 1 2 Up to two conduit clamps 2 MIN SEPARATION MIN
Up to two 90˚ PVC bends (2", 3", 4", or 6" " 3 5 preferred) ' 4 Up to two 10-ft sch 40 PVC conduits (one per 10 9' WORK 8' MIN 4 service conduit) 2", 3", 4", or 6" preferred; or Sch SPACE SEE NOTE 3 80 when service conduit risers are required by NEC 1 5 Service cable (up to two runs) 2
Customer-provided items installed by PSE 12" MIN SEE NOTE 4 6 Up to two 15" min. long standoff brackets 6" THIS PORTION IS INSTALLED BY CUSTOMER 3 24" 7 Up to two conduit clamps SEE NOTE 2 SECONDARY Up to two 25-ft * sch 40 PVC service conduit 8 risers 5 9 Service cable (final 30-40 ft; up to two runs) PSE’S POWER POLE 10 Weatherhead
* 25 FT ASSUMES THE PSE POLE IS 45 FT OR SMALLER. LARGER POLES REQUIRE EXTRA CONDUIT INSTALLATION NOTES: 1. All customer-provided material must be on-site for PSE to install. 2. The 1st customer-installed standoff bracket must be located 6 in. belowgrade on the pole. 3. The 2nd customer-installed standoff bracket must be located 8 ft. abovegrade on the pole. 4. Customer-installed conduit riser sections shall extend 12 in. belowgrade. The remaining abovegrade conduit risers shall be installed 9 ft. abovegrade. 5. Maintain 5 in. minimum separation between the pole and conduit risers. 6. Leave sufficient service cable (Item 9) coiled for PSE crew to install through the top 25 ft. riser section and complete connection to transformer(s).
Electric Service Handbook 2021 — Non-residential Projects 17 Chapter 2
Figure 7 PSE-installed underground connection handhole
SECONDARY HANDHOLE PSE-INSTALLED FINAL GRADE
SECONDARY RISER, CONDUIT, AND SERVICE RUN TO SECONDARY HANDHOLE. CONSULT PSE FOR NUMBER OF PSE-INSTALLED (CUSTOMER IS STILL RUNS ALLOWED IN SECONDARY RESPONSIBLE FOR TRENCHING) HANDHOLE. CUSTOMER-INSTALLED
Racking of cable in vaults The following applies to 7- x 7- x 6-foot vaults for three-phase padmount transformers of 500 kVA and greater, where 12 or more runs of 500 kcmil or larger cables are installed.
Cable ladder In all 7- x 7- x 6-foot vaults, PSE would install or provide a 30-inch x 4-foot ladder with 6-inch spacing between rungs. The cable ladder will be positioned approximately 19 inches from the left side of the vault wall under the cable access hole.
Cable supports Cable support racks and arms, that hold cables along the perimeter of the vault wall, are recommended but not required by PSE. If cable supports are installed, they shall extend a maximum of 2 feet from the vault wall. The customer may install as many cable supports as they consider necessary.
Cable The requirements for cable training and identification are shown below. training and • The cable shall extend a minimum of 7 feet above the transformer pad. identification • All cables shall be bundled together by phase. • Cables shall be zip tied to the cable ladder rungs. • The neutral conductor shall be positioned on the cable ladder (see Figure 9). • The cable shall be marked with colored tape to indicate its phase. Color extruded, jacketed conductors are also acceptable for identification.
Electric Service Handbook 2021 — Non-residential Projects 18 Chapter 2
Figure 8 Minimum dimensions and excavation requirements for a three-phase padmount transformer vault, 500 kVA and larger
PLAN VIEW
8' - 0" 8' - 0" OR 10' - 0"
8" 11' - 0"
4' - 2"
NO SECONDARY 3' - 6" 11' - 0"
SIDE VIEW 2"
7' - 0" 7' - 0" 4' - 6" 6" CRUSHED ROCK
Figure 9 Racking of cable in vaults
PLAN VIEW 8' - 0" 8' - 0" OR 10' - 0"
8"
NEUTRAL CONDUCTOR 11' - 0" PRIMARY PHASE CONDUCTORS CONDUIT 6' - 2" (PSE)
NO SECONDARY
5' - 6" 11' - 0"
SIDE VIEW 2"
6' - 6" 6" 7' - 0" CRUSHED 7' - 0" ROCK
Electric Service Handbook 2021 — Non-residential Projects 19 Chapter 2
Customer wiring to energized PSE transformers
Excavating to Before installing commercial service underground cable into any energized expose existing transformer, coordinate the work with PSE to ensure a safe installation. buried primary voltage power
Single-phase Your electrician may insert conduit 2 inches into an energized minipad transformer. minipad Routinely, PSE must uncover existing buried primary power cables in order to transformers maintain, intercept and reroute, or cut new equipment into the circuit such as transformers or J-boxes. In these situations, the excavation taking place must be coordinated with the customer with respect to the hazards a buried energized line presents. Customers preparing a trench up to a cable intercept point shall not uncover the cable ahead of the scheduled date for line work. Customers preparing a trench route to a cable intercept point must stop 3 feet from locate marks prior to the start of PSE line construction work. The cable shall be isolated, tested, and grounded, by qualified electrical workers, rendering the cable de-energized. Only then may a customer proceed to expose PSE’s cable through normal safe work and digging practices. For single-phase padmount transformer vaults with unistrut construction, you may, at your discretion, provide a minimum 24-inch radius PVC bend for PSE to attach to the unistrut. Work that involves inserting or pulling cable into the minipad handhole shall be done only: • After the transformer has been de-energized. • With the on-site assistance of a PSE journeyman. To train the cable and mark the runs: • Mark the cables and group them together. • Label the conductors with the location and service address. • Leave no more than 8 feet of cable coiled in the vault, neatly installed and taped together.
Three-phase The customer’s electrician may install and grout conduit into a vault wall or insert/pull padmount cable into three-phase transformer vaults only: transformers • After the transformer has been de-energized. • With the on-site assistance of a PSE journeyman. To train the cable and mark the runs: • Label each cable’s phase and the neutrals. • Depending on the entry wall and vault size, leave 20-30 feet of cable coiled in the vault. Contact your project manager for the exact cable footage.
Electric Service Handbook 2021 — Non-residential Projects 20 Chapter 2
Transformer locations PSE will install padmount transformers using the clearances listed in Table 4 and shown in Figures 10 and 11. Clearances between padmount transformers and structures must be measured from the metal portion of the transformer closest to the building or structure, including any building overhangs, within the following clearances:
Table 4 Clearances for padmount transformers Feature Clearance distance Combustible walls or roof (including stucco). 10 feet (3 feet from a combustible wall if using a reduced flammability transformer). See Figure 10. Noncombustible walls (including brick, concrete, 3 feet. See Figure 10. steel, and stone), provided the side of the transformer facing the wall does not have doors. Materials that pass UBC Standard 2-1 or ASTM E136-79 are considered to be noncombustible. Fire sprinkler valves, standpipes, and fire hydrants. 6 feet. See Figure 11 Doors, windows, vents, fire escapes, and other 10 feet. See Figure 11. building openings. The water’s edge of a swimming pool or any body 15 feet. See Figure 11. of water. Individual domestic and irrigation wells. 100 feet. See Figure 11. Facilities used to dispense or store LP or 20 feet. See Figure 12. hazardous liquids or fuels. 10 feet. See Figure 12. Gas service meter relief vents. 3 feet. See Figure 11.
Electric Service Handbook 2021 — Non-residential Projects 21 Chapter 2
Figure 10 Clearances for transformers from structures
10' 3'
10'
10'
APPROVED APPROVED TRANSFORMER TRANSFORMER AREA AREA
10' 3' COMBUSTIBLE BUILDING WALLS AND ROOF COMBUSTIBLE BUILDING WALLS AND ROOF
TRANSFORMER CLEARANCES FROM COMBUSTIBLE SURFACES REDUCED FLAMMABILITY TRANSFORMER CLEARANCES FROM COMBUSTIBLE SURFACES
COMBUSTIBLE NONCOMBUSTIBLE ROOF OR ROOF AND SOFFIT SOFFIT
3' 10' 3'
10'
APPROVED TRANSFORMER AREA APPROVED TRANSFORMER AREA NONCOMBUSTIBLE BUILDING WALLSNONCOMBUSTIBLE BUILDING
3' WALLSNONCOMBUSTIBLE BUILDING 3'
TRANSFORMER CLEARANCES FROM TRANSFORMER CLEARANCES FROM NONCOMBUSTIBLE SURFACES NONCOMBUSTIBLE WALLS WITH COMBUSTIBLE ROOFING
Electric Service Handbook 2021 — Non-residential Projects 22 Chapter 2
Figure 11 Clearances for transformers
100' TRANSFORMER WELL HEAD 15' POOLS OR BODIES OF WATER
DOOR, WINDOW, VENT, OR OTHER OPENING 10'
GAS METER RELIEF SPRINKLER VALVE, VENT STANDPIPE, OR FUEL HYDRANT TANK 3' TRANSFORMER 6'
10' FIRE ESCAPE
20'
Figure 12 Minimum clearances from oil-filled equipment to LP, hazardous liquid, or fuel tanks
6' MIN OIL-FILLED ELECTRICAL 20' EQUIPMENT MIN
LP TANK
TOP VIEW LP TANK
OIL-FILLED ELECTRICAL EQUIPMENT
10' MIN
DIKE OF ADEQUATE HEIGHT TO CONTAIN OIL AND NOT ALLOW IT TO FLOW TOWARDS THE LP TANK
Electric Service Handbook 2021 — Non-residential Projects 23 Chapter 2
Landscaping and other obstacles Landscaping and other obstructions shall not encroach on the clearances shown in Figures 13 and 14.
Working space A clear and level working area equal to the full width of the equipment operating compartments shall extend a minimum of 10 feet from the compartment opening for padmount equipment and 10 feet in front of subsurface equipment in vaults (see Figures 13 and 14). A minimum of 3 feet of clear working area for subsurface equipment and 18 inches for padmount equipment (see Figures 13 and 14) shall be provided on the sides of the electrical equipment without operating compartments (including sides with cooling fins). A clearance of 36 inches is required on padmounted equipment with cooling fins (see Figure 14).
Figure 13 Plan view of subsurface equipment clear working space
3' MIN
CLEAR WORKING SPACE
3' 10' MIN MIN
3' MIN CLEAR WORKING SPACE
Electric Service Handbook 2021 — Non-residential Projects 24 Chapter 2
Figure 14 Plan view of padmount equipment clear working space
VAULT LID 18" MIN CLEAR 36" WORKING SPACE MIN EQUIPMENT ACCESS DOOR
10' MIN
EQUIPMENT CLEAR ACCESS DOOR WORKING COOLING SPACE FINS 18" MIN
Guard posts for padmount and subsurface equipment Washington Administrative Code (WAC) requires guard posts around padmounted equipment that is exposed to vehicular traffic. PSE guard post location requirements are shown in Figure 15. You are required to supply and install these guard posts or pay PSE to supply and install them.
Figure 15 Guard post location requirements
GUARD POSTS TYPICAL 8' X 8' CONCRETE PAD 5' 5' MAX MAX
3' MIN
5' 5' MAX MAX
TYPICAL TRANSFORMER 18" 18" MIN MIN
5' 5' MAX MAX
4' MAX 3' MIN ACCESS 5' 5' DOOR SWING MAX MAX
NOTE: Installation of guard posts must be completed before the primary cable is installed and energized.
Electric Service Handbook 2021 — Non-residential Projects 25 Chapter 2
Approved The following styles of guard posts are approved for PSE transformers: guard posts • Schedule 40 or better galvanized steel pipe filled with concrete, 6 feet x 4 inches in diameter. The concrete shall have a minimum compressive strength of 3,000 psi after 28 days. The exposed section of the post shall be painted traffic yellow. • Precast steel-reinforced concrete post, 6 feet x 9 inches in diameter. These posts are available from Utility Vault Company, Auburn, WA; or Hanson Inc., Tacoma, WA. The exposed portion of the post shall be painted traffic yellow. • Set the post 30 inches deep in undisturbed soil. If soil has been disturbed, use concrete to stabilize the post. • Backfill the holes with concrete. Figure 16 illustrates both styles of guard posts.
Figure 16 Typical guard posts
GALVANIZED STEEL FILLED WITH CONCRETE PRECAST CONCRETE
CONCRETE DOME TOP 1" DIAMETER LIFT HOLE
3' - 6" 3' - 6" LENGTH LENGTH PAINTED PAINTED YELLOW YELLOW
6' - 0" 6' - 0" CONCRETE CONCRETE
30"
6" 6" 6" 9" 6" 4"
Electric Service Handbook 2021 — Non-residential Projects 26 Chapter 2
Fault current levels The most commonly used padmounted transformers installed by PSE are shown in Tables 5, 6, and 7. The tables below also show the maximum available short-circuit current at the transformer’s secondary connection point.
Table 5 Maximum short circuit current (in amps) for single-phase transformers, padmounted Type Secondary kVA R/X 120 V 240 V Voltage Winding Winding Min %Z Fault Min %Z Fault Current Current 1-Phase 240/120 25 0.8 2.23 9300 1.7 6100 PM 37.5 0.7 2.23 14000 1.7 9200 50 0.6 2.23 18700 1.7 12300
75 0.5 2.34 26700 1.8 17400 100 0.5 2.30 36200 1.8 23100 167 0.5 2.43 57300 1.9 36600
Table 6 Maximum short circuit current (in amps) for three-phase transformers, padmounted Type Secondary kVA R/X Minimum 3 Phase &/or L-G Voltage %Z Fault Current 3-Phase 208Y/120 45 0.8 1.65 7600 PM 112.5 0.3 1.65 19000 150 0.3 1.55 26900 225 0.2 2.15 29100 300 0.3 2.10 39700 500 0.2 2.30 60300 750 0.1 5.30 39300 1000 0.1 5.30 52400 480Y/277 45 0.8 1.65 3300 112.5 0.3 1.65 8200 150 0.3 1.55 11600 225 0.2 2.15 12600 300 0.3 2.10 17200 500 0.2 2.30 26100 750 0.1 5.30 17000 1000 0.1 5.30 22700 1500 0.1 5.30 34000 2000 0.1 5.30 45400 2500 0.1 5.30 56700
Electric Service Handbook 2021 — Non-residential Projects 27 Chapter 2
Table 7 Maximum short circuit current (in amps) for Y-Y grounded transformers Type Secondary kVA R/X Minimum 3 Phase &/or L-G Voltage %Z Fault Current Three 1-phase 208Y/120 30 2.10 4000 OH & UG Banks 45 0.9 2.00 6200 75 0.8 1.70 12200 112.5 0.7 1.70 18400 150 0.6 1.70 24500 225 0.5 1.80 34700 300 0.5 1.80 46300 500 0.5 1.90 73000 480Y/277 30 2.10 1700 45 0.9 2.16 2500 75 0.8 1.90 4800 112.5 0.7 1.70 8000 150 0.6 1.70 10600 225 0.5 1.80 15000 300 0.5 1.80 20100 500 0.5 1.90 31700 1000 2.20 54600 1500 2.30 78500
Electric Service Handbook 2021 — Non-residential Projects 28 Chapter 3
Permanent overhead services
This chapter provides you with information on PSE’s permanent overhead service installation. Please follow these requirements to avoid a delay in your service hookup. If you have any questions about this information, call Customer Construction Services (CCS) at 1-888-321-7779.
Service equipment installation responsibilities
Puget Sound PSE is responsible for furnishing, installing, and maintaining the primary system Energy equipment, overhead service wire, current transformers (CT), meter(s), and meter wiring.
Customer You are responsible for furnishing, installing, and maintaining all required service entrance equipment, including the service entrance conductors from the meter base/ socket or current transformer enclosure to PSE’s designated point of delivery. The point of delivery for overhead service is at the connectors on the weatherhead. For services where CTs are required, you will also need to run conduit from the CT enclosure to the meter base. Refer to Chapter 4, Section 3, Current Transformer (CT) Metering Requirements (up to 800 A) for more information.
Preparing for your service hookup The following list will help you prepare your project for the installation of an overhead service. After you complete these items, PSE will install the metering equipment and connect your service. 1. Check for any local ordinances/covenants that may prevent you from obtaining an overhead service. 2. Complete Electric Service Application Permanent Non-Residential 201E or Electric Service Multi-Family Development 400E. All forms can be downloaded at pse.com/construction-services. 3. Supply site drawings and load information to your CCS Representative (refer to the Submitting an Application for Service section in Chapter 1). 4. Contact CCS to determine where your overhead service will originate. 5. Determine an approved meter location (refer to the Meter locations in Section 1, General Metering Requirements, of Chapter 4, Meter Installation). 6. Verify that the service mast height requirements have been met. 7. Provide and maintain a path, clear of obstructions, between PSE’s pole and your service mast. 8. Provide payment for any preconstruction costs determined by your CCS Representative. 9. Install the required service equipment.
Electric Service Handbook 2021 — Non-residential Projects 29 Chapter 3
10. Provide and install service entrance conductors (leave a minimum of 18 inches exposed at the weatherhead). 11. Connect the meter bases/sockets and permanently label them to indicate the part of the premises they serve, such as unit number. 12. Obtain an approved electrical inspection. 13. Call CCS at 1-888-321-7779 to initiate connection and energize your new service.
Service mast requirements All requirements for the installation of the service mast are located in the National Electric Code (NEC) and the Washington Administrative Code (WAC) 296-46B. The following are PSE-specific requirements.
Height PSE can assist you with determining the proper service mast height. Call CCS at requirements 1-888-321-7779 for assistance.
Clearances from A minimum radial clearance of 3 feet is required between electric service equipment gas meters and the natural gas meter pressure relief vent.
Additional mast Additional mast supports, typically a guy or a brace, are required for any service line supports over 100 feet in length.
Screw-in service knobs For new or altered overhead service lines, you must provide a substantial point of attachment that meets NEC requirements. Older screw-in type service knobs attached to the home’s wall are often inadequate to support modern triplexed service lines. PSE may prohibit use of service knobs if deemed inadequate.
Figure 17 Minimum clearance requirements upon installation
70' MAXIMUM
SERVICE LINE (UTILITY OWNED)
TEMPORARY SERVICE 26' MIN
18' MIN 16' MIN 12' MIN 10' MIN
STATE HIGHWAYS STREETS, ALLEYS, DRIVEWAYS, AND NON-TRAFFIC COUNTY ROADS PARKING AREAS PROPERTY
Electric Service Handbook 2021 — Non-residential Projects 30 Chapter 3
Installing the service equipment
List of You are responsible for installing the following: customer- • Meter base/socket provided service • Current transformer (CT) enclosure and conduit between the meter base/socket, entrance if required equipment • Service mast • Insulated clevis for service attachment • Service entrance conductor • Ground rods NOTE: PSE will install the service line and meter, as well as CTs and meter wiring if they are required.
Terrain Meter base/socket locations are covered in Chapter 4, Section 1 of this handbook. considerations However, consider the type of terrain the electrical service line will cross when choosing for meter base/ a meter location. PSE strongly suggests avoiding service line routes that cross a socket locations driveway. Service lines crossing driveways can be hit by vehicles, causing damage to the service equipment or structure.
Contact CCS at 1-888-321-7779 for the minimum height clearance requirements of overhead service wires. If the service line will pass through any trees, you are required to prune those trees to provide a clear path for the service line. You are also responsible for regular tree pruning, and if necessary, tree removal to keep the path clear.
Customer-owned meter pole
Meter pole If a meter pole is required for the project, it is your responsibility to purchase and install requirements it. The meter pole must meet the following requirements: • Be sound, round, and made out of wood • Fully pressure treated • Class 6 or better • 35 feet long minimum • Minimum diameter of 5-1/2 inches at the top • Butt gain cut 12 feet from the bottom of the pole NOTE: Multiple meter installations shall be approved by PSE’s Meter Department.
Meter pole Meter poles must be: locations • Accessible for reading and testing the meter • Installed within 30 feet of the commercial building (typically)
Meter pole Meter pole installations must be: installation • Buried a minimum of 10 percent of the pole’s length plus 2 feet. If soil conditions are poor, use crushed rock as a substitute for backfill to stabilize the pole. • Guyed if the service line crosses a public road or if the distance between the meter pole and PSE’s pole is greater than 70 feet. A push brace or pole key brace may be used if guy space is not available. Electric Service Handbook 2021 — Non-residential Projects 31 Chapter 3
Figure 18 Permanent overhead meter pole installation
OVERHEAD TO UNDERGROUND OVERHEAD TO OVERHEAD
UTILITY-OWNED CUSTOMER-OWNED UTILITY-OWNED CUSTOMER-OWNED AND INSTALLED AND INSTALLED AND INSTALLED AND INSTALLED
8 8 1 1 POINT OF POINT OF ATTACHMENT POINT OF ATTACHMENT POINT OF DELIVERY 7 DELIVERY 7 6 6 OVERHEAD SERVICE LOAD IF APPLICABLE
5 5 9 9
2 2 6' MAX 6' MAX 4' MIN 4' MIN 3 3
10% OF POLE 10% OF POLE 4 LENGTH, +2' 4 LENGTH, +2' ANCHOR ROD* ANCHOR ROD *
* ANCHORS SHOULD BE EITHER SCREW TYPE OR CROSS-PLATE TYPE.
Items owned and installed by customer Items owned and installed by PSE 1 Customer-owned meter pole 8 Service line 2 Meter base/socket 9 Meter 3 Ground wire, in accordance with NEC/WAC 4 Ground rods, in accordance with NEC/WAC Down guy, 5/16" minimum diameter noncorrosive stranded steel wire required 5 for services over 70 ft from PSE pole. Push brace or pole key brace may be substituted for down guy. Service entrance conductors - 18" out of 6 weatherhead 7 Insulated clevis
Electric Service Handbook 2021 — Non-residential Projects 32 Chapter 4
Meter installation
This chapter provides you with information on PSE’s metering requirements. Please follow these requirements to avoid a delay in your service hookup. If you have any questions about this information, call Customer Construction Services (CCS) at 1-888-321-7779. NOTE: Services that require switchgear installation or CT metering require the approval of PSE Meter Engineering. A PSE Project Manager will coordinate this process. Please see PSE Form 7517 for information on preapproved meter catalog numbers. It is located on PSE’s Construction Services Guides and Handbooks web page. This chapter is divided into three sections: Section 1: General Metering Requirements Meter installations requirements such as meter location, clearances, and multiple meter installations. Section 2: Self-Contained Metering Requirements For single-phase service 400 A or less, and three-phase services 200 A or less. Section 3: Current Transformer (CT) Metering Requirements (up to 800 A) For services up to 800 A and switchboard metering for services over 800 A.
Other contacts
If you have Net Metering or cogeneration questions please email [email protected].
Section 1: General metering requirements
Metering equipment responsibilities
Puget Sound PSE will furnish, install, and maintain the following equipment: Energy • Revenue meters • Current transformers (CT) • CT meter wiring • The connectors where your service line interconnects with PSE’s equipment.
Electric Service Handbook 2021 — Non-residential Projects 33 Chapter 4
Customer You will be responsible for furnishing, installing, and maintaining the following equipment (located beyond the point of delivery): • Meter bases/sockets • All necessary wiring and connections (except CT meter wiring) • Switches • Enclosures • Gray electrical conduit • Protection equipment
Other customer responsibilities
Installing or Only authorized and qualified PSE personnel shall cut seals and emover or install removing meters. meters by However, under emergency conditions, exceptions may be granted to qualified a qualified electricians by contacting CCS at 1-888-321-7779 Monday thru Friday, 7 a.m. − 5 p.m. electrician Outside of these hours, please call Customer Service at 1-888-225-5773. When this occurs, the qualified electrician shall accept all liability for damage or alteration to equipment, injury to persons or property, and loss of revenue to PSE from the time the seal is removed until 72 hours after PSE has been notified that the equipment is ready to be resealed. The customer or contractor shall promptly notify PSE when repairs or modifications are complete. WARNING: Use extreme caution when removing and installing meters. Depending upon the type of service or meter base, removal of the meter does not necessarily de-energize service.
Inspections and Before a new service is energized, the installation shall be inspected and approved by approvals the governing city or state electrical inspector.
Sealing CT enclosures, switchgear, gutters that contain unmetered conductors, and metering provisions on equipment shall have provisions for sealing. enclosures
Service Metered circuits shall not enter raceways or enclosures containing unmetered circuits, conductors except for meter loops on poles. All conductors shall be securely fastened in their terminals. Aluminum conductor connections require corrosion inhibitor (electrical joint compound).
Grounding All meter bases/sockets, enclosures, and conduit shall be bonded and grounded in accordance with Articles 230 and 250 of the latest edition of the NEC. When self-contained meter bases/sockets are used, the neutral conductor shall be connected to the neutral terminal in the socket.
Electric Service Handbook 2021 — Non-residential Projects 34 Chapter 4
Labeling Where multiple meters or remote meters are installed, meter base/sockets shall be permanently labeled to indicate the address they serve. PSE requires engraved phenolic nameplates or adhesive die-cut labels at least 1 inch high, with raised or cut-out lettering that is a minimum of 3/4 inch high. All lettering should be capitalized. Service will not be established until marking is complete. NOTE: Felt-tip pens and label maker tape are not considered permanent marking.
Customer The customer’s load monitoring equipment shall be installed only on the load side of equipment PSE’s metering. No customer equipment shall be allowed inside a meter or current transformer enclosure. This includes customer load monitoring and control devices and any other customer owned equipment. NOTE: Meter base/socket and current transformer enclosures shall not be used as a junction box.
Current-limiting Current-limiting fuses to protect the customer’s electrical system from high fault current fuses shall not be installed in meter bases/sockets, instrument transformer enclosures, or PSE’s distribution transformers. They may be installed in the customer’s service panel or in a separate enclosure between the socket and the panel. Current-limiting fuses are not allowed ahead of the meter or CT enclosure.
Meter locations
Location NOTE: Contact your PSE Project Manager or CCS to initiate the PSE Meter requirements Engineering review and approval process. All meter locations shall meet the requirements written in this handbook. You are required to provide a location to install metering equipment. The meter location must be free from obstruction, corrosive atmosphere, and abnormal temperature or vibration, and must be convenient to PSE’s distribution system. All meters, instrument transformers, and PSE-owned meter equipment shall be installed at ground-level locations (except for high-rise residential structures) that are accessible 24 hours a day, 7 days a week, for meter reading, maintenance, and installation or removal. NOTE: Mezzanines are not considered to be at ground level and are not acceptable for the location of PSE meter equipment. The meter base/socket shall be installed outside on schools, churches, halls, or other similar structures that may be locked during normal business hours.
Prohibited Meters or metering equipment shall not be installed at any of the following locations: locations • Below the first level of a building. • In commercial occupancies they do not serve. • Any place where safety may be compromised. • On poles owned by PSE. • On any line pole occupied solely by the telephone company, except to serve telephone company equipment.
Electric Service Handbook 2021 — Non-residential Projects 35 Chapter 4
Meter location If you are installing an overhead service to a manufactured commercial structure, our requirements for service equipment can be installed on the manufactured commercial structure or on a manufactured customer-owned meter pole. commercial Meter bases/sockets installed on manufactured commercial structures are required structures to be: (school portables, • Located on an outside wall of your structure and accessible for reading and testing. industrial • Installed 4 to 6 feet above finished grade with a service mast that meets modular office, NEC requirements. etc.) • The proper type for the service (see Table 8). Meter bases/sockets must not be installed: • In a breezeway. • In an area that is subject to being fenced.
Electrical room requirements Meter bases/sockets, where an exterior location is not available for metering equipment and CT enclosures, must be located inside an electrical room that shall be used solely for power and communication equipment and fire equipment as required by NEC . The electrical room must be located on the first/lobby level (main entrance) or the level of the parking garage entrance. NOTE: The electrical room walls must be in permanent construction. The electrical room shall be accessible 24 hours a day, 7 days a week. Additionally, the equipment room shall be well lit and not used for storage. All electrical room requirements must be met before PSE installs meter(s). You must provide the following: • Door. A door, equipped with panic bars, that leads directly to the outside, or with prior approval from the PSE Meter Engineering, directly to a publicly accessible lobby of the structure’s main entrance that is not restricted by security. The size of the door shall be a minimum of 2 feet 8 inches x 6 feet 8 inches. • Keybox. A location within 6 inches of the electric meter room door for the installation of a keybox, a key fitting the electrical room door for the keybox, and a sign on the exterior of the door stating “Electrical Room.” If multiple electrical rooms are needed, each electrical room door shall have a dedicated keybox with key. NOTE: If door locks are changed, it is your responsibility to contact CCS to coordinate the exchange of new keys. • Conduit for AMR/AMI antenna. A 2-inch gray PVC conduit, from each electrical room to a NEMA 3R enclosure on the exterior of the building used for the automated meter reading (AMR/AMI) antenna. » The conduit shall have a maximum of 360 degrees in total bends and be no more than 25 lineal feet total length. » If a single meter is installed within the electrical room, the total length of the conduit may be extended to 70 lineal feet. » Contact CCS if the conduit length is greater than 25 feet. » Antenna enclosure requirements are shown in Figure 19. » A 1/8 inch minimum pull string is to be provided in the conduit.
Electric Service Handbook 2021 — Non-residential Projects 36 Chapter 4
• Conduits for AMR/AMI antenna shall be labeled “PSE Use Only” in meter room(s). • Conduit pathway for high-rise residential only. If the building has multiple aboveground electrical rooms where meters are located, a 2-inch PVC conduit pathway connecting all of the equipment rooms shall be provided for the AMR/AMI antenna cable. » From the top level electrical room, provide a 2-inch conduit to a NEMA 3R enclosure mounted on the roof of the building. » Mount the enclosure above the building facade and other obstructions. Preferred locations are adjacent to or on top of the rooftop mechanical room or within antenna farm locations (see Figure 19). • NEMA 3R antenna enclosure. A NEMA 3R antenna enclosure shall be located on the first story outside wall 8 to 10 feet aboveground for buildings with one electrical room. • 2-foot-square piece of 3/4-inch plywood. A 2-foot-square piece of 3/4-inch plywood shall be mounted on the wall of the electrical room for an AMR/AMI repeater. Mount the plywood 4 to 6 feet above the floor near the antenna conduit entry location into the room. Provide a dedicated 120 V receptacle adjacent to the plywood.
Figure 19 Typical 8 in. x 8 in. x 6 in. exterior wall-mounted AMR/AMI antenna installations
DISC ANTENNA ENCLOSURE 14" ANTENNA ENCLOSURE
ANTENNA (PSE PROVIDED)
14"
EXTERIOR TO ELECTRICAL ROOM 4" 2" BUILDING EXTERIOR WALL 6" NEMA 3R ENCLOSURE BUILDING WALL LMR 400 CABLE (CUSTOMER- (OR LIKE) PROVIDED) LMR 400 CABLE PSE-PROVIDED (OR LIKE) PSE-PROVIDED
8" LOW-PROFILE 8" DISC ANTENNA 2" CONDUIT (R=2.25") PSE-PROVIDED (CUSTOMER- 2" CONDUIT PROVIDED) (CUSTOMER-PROVIDED) RG-58U CABLE CONNECTOR NEMA 3R ENCLOSURE (CUSTOMER-PROVIDED) CONNECTOR
Electric Service Handbook 2021 — Non-residential Projects 37 Chapter 4
Electrical room locations in high-rise buildings Electrical rooms in high-rise* buildings shall be coordinated with PSE Meter Engineering during the design stage of construction, and approved prior to construction. * PSE will consider buildings five stories and taller as “high-rise” for the purposes of this section. If a high-rise building project qualifies for allowing PSE metering beyond a customer transformer, (typically a dry type 480/208 volt); a transformer loss billing agreement must be completed per PSE Standard 6325.3370 prior to PSE meter installation.
Meter bases/sockets
General Meter bases/sockets and enclosures shall be acceptable to PSE, accepted by an requirements approved testing laboratory, and must fulfill these requirements: • All meter bases/sockets shall be ring-type and shall include either a screw-type locking ring (preferred) or a stainless steel snap ring. • Sockets for nonresidential loads require a manual block bypass. Automatic circuit closures or lever bypasses are not acceptable. • Any meter base/socket containing energized equipment shall be covered and sealed with a transparent cover plate if a meter is not installed. • Meters shall be installed only in sockets that are level, plumb, and securely fastened to the structure. • Meter base/sockets shall be permanently labeled to indicate the address they serve. PSE requires engraved phenolic nameplates or adhesive die-cut labels at least 1 inch high and lettering a minimum of 3/4 inch high. Service will not be established until marking is complete. NOTE: Felt-tip pens and label maker tape are not considered permanent marking. • All unused openings of the meter base/socket enclosure shall be closed with plugs that are secured tightly in place from inside the enclosures before a meter is installed. • All meter equipment exposed to weather shall be raintight according to the National Electrical Manufacturer’s Association (NEMA) 3R minimum. • Terminals shall be marked with a conductor range for aluminum or copper conductors. When aluminum conductors are used, the socket must be approved and clearly marked by the manufacturer for that use. • CT enclosures, switchgear, gutters that contain unmetered conductors, and metering equipment shall have provisions for sealing. CAUTION: Strands shall not be removed to make conductors fit undersized terminals. Meter bases/sockets shall not be jumped to provide power.
Determining To determine meter base/socket types for specific voltages and amperage ratings use meter base/ Table 8. socket type
Electric Service Handbook 2021 — Non-residential Projects 38 Chapter 4
Meter base/ NOTE: The center of the meter base/socket is always the point of reference. socket clearances For... Clearance
Base/Socket height Meter base/socket height shall be 4 feet minimum to 6 feet maximum above finished grade or floor (see Figure 20).
Working space • Working space in front of metering equipment not installed in switchgear (including current transformer enclosures) shall be at least 3 feet wide and 3 feet deep, measured from the front of the enclosure or meter face (see Figure 20). Plants, shrubs, and trees shall not be planted in this space. • Working space in front of PSE metering equipment installed in switchgear shall be at least 6-feet deep and extend the full width of the section containing PSE equipment (see Figure 21). • All meter locations must maintain 6-feet of worker headroom. • The center of all meter base/socket enclosures shall be a minimum of 18 inches from adjacent walls, ceilings, or other similar obstructions (see Figure 20). • All service equipment, including disconnect switches, shall be a minimum of 10 inches from the meter’s center. • Building siding shall not cover or overlap the meter base/socket.
Minimum clearance The diagrams and the measurements provided in from gas meter Gas and Electric Underground Service Installation Requirements show the required minimum distances between building features and the relief vent.
Recessed meters When a meter base/socket enclosure is recessed in the building wall, a flush-type socket is required and mounted flush with the exterior wall. Recessed meter bases/sockets require a clearance of 10 inches in all directions between the center of the meter and the closest portion of the wall (see Figure 22).
Electric Service Handbook 2021 — Non-residential Projects 39 Chapter 4
Figure 20 Meter base/socket minimum clearances, without switchgear
TOP VIEW 36" 18" MIN
WORKING 3' MIN SPACE 18" MIN
8' 3' MIN MAX 6' 4' MIN MIN 6' MAX HEADROOM (SEE WORKING SPACE ON PAGE 39)
6" MIN
3' MIN 3' MIN
Figure 21 Switchgear installed meter and current transformer minimum clearances
6 FEET OF CLEAR WORKING SPACE IS REQUIRED ALONG THE FULL 6' WIDTH OF THE MIN SWITCHGEAR HEADROOM SECTION WITH (SEE WORKING PSE EQUIPMENT SPACE ON PAGE 39) CT ENCLOSURES REQUIRE A SIDE WALL CLEARANCE *W OR OTHER OBSTRUCTION CLEARANCE OF 2 INCHES.
6' DIMENSION *W=WIDTH OF CUSTOMER SPECIFIED SWITCHGEAR
Electric Service Handbook 2021 — Non-residential Projects 40 Chapter 4
Figure 22 Minimum clearances for recessed meters
10" MIN
10" MIN 4" MAX
SIDING OR BRICK FACADE
EXTERIOR WALL
Remote metering Normally, a meter base/socket and associated devices (current transformers, etc.) are attached to a permanent or fixed structure, such as a building, that contains the load being served. Remote metering is allowed if there is no permanent or fixed structure for the load, or when otherwise agreed to by PSE Meter Engineering. Remote metering consists of a meter on a meter pedestal. Safe parking must be located within 50 feet of the meter. All remote metering requires PSE Meter Engineering approval before construction begins. Contact CCS if you require remote metering.
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Meter pedestal Meter pedestals must meet the specifications of EUSERC Section 300 (Metering requirements and Service Equipment 0 − 600 V), and drawings 308, with the following additional for remote specifications for the meter base/socket: metering • The meter base/socket shall be a 200 A Form 12S with the fifth jaw in the 9 o’clock position. • The test/bypass safety disconnect shall meet EUSERC drawings 311 or 312. • Enclosed metering for protection from vandalism must meet EUSERC drawings 300 and 308 and PSE pedestal clearance and socket requirements. Installations that do not meet these requirements will need written permission from PSE Meter Engineering to proceed. • Drawings shall be submitted for approval by the manufacturer, noting the EUSERC and PSE drawings and specifications used. • Meter pedestals shall be on structures such as masonry, concrete, or metal. • Meter pedestals exposed to vehicular traffic (other than those used for traffic management loads) shall be protected by guard posts as described in the Guard posts for padmount and subsurface equipment section in Chapter 2, Permanent Overhead Services. • Single-phase remote services 60 A or less can be mounted on a 6- x 6-inch fully pressure-treated wood post. The minimum height of the meter shall be 3 feet. A 60 A or less main ac panel may also be mounted on the same wood post.
Meter pedestal The metering pedestal must be located so that the access for the metering and pull location section are free of surrounding obstructions, with at least 36 inches of working space clearance surrounding the equipment. Safe parking shall be available within 50 feet of the meter.
Remote service • Remote services 800 A or less for nonresidential loads shall be mounted on requirements permanent support structures that are made of galvanized steel pipe with unistrut based on cross-braces, concrete, or masonry blocks. Support structures made of wood service (treated or not) are unacceptable. ampacity » The customer shall provide a 3-foot x 3-foot x 3-inch-thick concrete pad surrounding the meter or holes 2 feet deep that are filled with concrete to anchor the structure. » The minimum height of the meter shall be 3 feet. » Other requirements specified in this handbook for meter bases/sockets and CT enclosures apply. • Remote services greater than 800 A − Remote services 800 A or greater require EUSERC outdoor switchgear. Ask your CCS Representative for more information.
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Multiple meter installations
Multifamily On residential multimeter panels, the minimum spacing between socket centers shall be 7-1/2 inches horizontally, 8-1/2 inches vertically, and the center line shall be a minimum of 4 feet and a maximum of 6 feet above the floor or finished grade. This configuration allows for five (5) vertical sockets maximum. Multimeter installations serving residential living units shall comply with the equipment arrangement requirements are shown in Figure 23. Meter base/socket jumpers shall not be used to serve house meters. House meters shall be served in the following ways: • A dedicated set of service entrance conductors. • A tap on the bussing of residential multimeter panels. • All-in-one factory assembled multimeter panels. NOTE: PSE requires house meters to have manual block bypasses.
Figure 23 Typical factory-built residential multimeter panel for multifamily complex
10" 7-1/2" 10" NONRESIDENTIAL METERS MIN MIN MIN RESIDENTIAL METERS 6"
APT 1 APT 2 APT 3 8-1/2" MIN
MAIN DISCONNECT APT 11 APT 12 APT 13
4' MIN 6' 6' MAX
APT 21 APT 22 APT 23 MAX
' SERVICE 3 SERVICE ENTRANCE MIN ENTRANCE
FLOOR OR FINISHED GRADE
PSE SECONDARY HANDHOLE OR NOTE: HOUSE METER BASES/SOCKETS TRANSFORMER VAULT TYPICALLY LOCATED NEAR REQUIRE A MANUAL BLOCK BYPASS THE PROPERTY LINE
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Nonresidential On nonresidential multiple meter panels, the minimum spacing between socket centers shall be 12 inches horizontally, 12 inches vertically, and the meter shall be a minimum of 4 feet and a maximum of 6 feet above the floor or finished grade. Meters shall be adequately protected from mechanical damage. Factory-built multiple meter equipment shall be approved by the PSE Meter Engineering. A typical example of a nonresidential multiple meter installation is shown in Figure 23.
Figure 24 Typical multiple nonresidential meter installations for services 200 A or less
12" MIN
232 NE 10ST. 234 NE 10ST. 236 NE 10ST. 238 NE 10ST 238 NE 10ST. SUITE A SUITE B 12" MIN
4' MIN 6' MAX
LOAD
SERVICE ENTRANCES FLOOR OR FINISHED GRADE
NOTES: Clearances in this drawing (nonresidential) also apply for factory-built multiple meter panels, except that meters may be a minimum of 4 feet above floor. Meter bases/sockets require a manual block bypass. More than six meters requires a main disconnect per NEC. 277/480 V series shall have a service disconnect ahead of each meter and a safety socket.
Multiple meter Meter bases/sockets shall be permanently labeled to indicate the part of the premises base/socket they serve (i.e., unit number). PSE requires engraved phenolic nameplates or adhesive labeling die-cut labels at least 1 inch high. Service will not be established until marking is complete. NOTE: Felt-tip pens and label maker tape are not considered permanent marking.
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Section 2: Self-contained metering requirements
Single-phase services: 400 A or less and three-phase services: 200 A or less
Meter base/socket main disconnect combinations
Meter base/socket and circuit breaker combinations are acceptable for 0−320 A, single-phase, and 0−200 A, three-phase services, provided the meter base/socket section meets PSE’s manual block bypass, sealing, equipment sequence, and dimensional requirements.
Manual All self-contained nonresidential meter bases/sockets (except single-phase temporary block bypass services and Rate Schedule 8) require a manual block bypass (see Table 8). Automatic requirements circuit closures or lever bypasses are not acceptable. NOTE: Schedule 8 is used for single-family customers that have a separate service for well pumps (serving no more than two residences), barns, outbuildings, or other loads on the same property as the residence. For this type of service PSE will install the secondary service line.
Disconnecting All services with self-contained meters shall have the meter ahead of the disconnect means and its switch, except for 277/480 V services, where the safety disconnect is ahead of the sequence meter. The safety disconnect must be colocated within 5 feet of the meter. A fused disconnect is preferred. Each meter shall have a corresponding disconnect. A single disconnect is not permitted for multiple meters. Single-phase 480 V streetlight metering requires a disconnect ahead of the meter.
Safety sockets A safety socket is required for self-contained 480 V sockets (see Table 8).
Load balancing When 120/208 V, three-phase transformers provide single-phase service, it is your responsibility to identify the service conductors and balance the load on the transformer.
Service conductor connections Service conductor connections should meet these requirements: • Line-side conductors shall always be connected to the top terminals of the meter base/socket. • You are responsible for ensuring that the connection of service entrance conductors in the meter base/socket are inspected and tightened before the service is energized. • Where safety sockets are used, circuit-connecting nuts shall be properly torqued (see Figure 24). NOTE: Meters will not be installed unless these connections are tight. • Meters will not be installed if conductors place undue strain on the terminal facilities. • Terminals shall be rated for the size of conductor to be used. • Service conductors shall be arranged in the socket to avoid interfering with the meter installation or operation of the manual block bypass (see Figures 25−27). CAUTION: Strands shall not be removed to make conductors fit undersized terminals.
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Figure 25 Typical safety socket
LINE LOAD
NOTE: All 277/480 V self-contained meters 200 A or less shall have an accessible disconnecting means ahead of each meter(s); a fused disconnect is preferred. NOTE: In three-phase delta 120/240 V services, the high leg shall be only on the right side of the meter base.
Figure 26 Typical arrangement of service conductors for underground commercial single-phase 320 A service
NOTE: METER BASE/SOCKET MUST BE GROUNDED PER NEC.
BYPASS STUDS BYPASS STUDS LOAD LUGS
LINE LUG LINE LUG
NEUTRAL BLOCK 8-1/2" MIN CUSTOMER WIRES
3" RIGID STEEL OR PVC REQUIRED FOR 320 A SCHEDULE 8 SERVICES. (MAY BE LOCATED IN THE BOTTOM CORNER OPPOSITE THE NEUTRAL BLOCK OR CENTER OF THE ENCLOSURE)
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Figure 27 Typical arrangement of service conductors for overhead commercial single-phase 320 A service SERVICE ENTRANCE CONDUCTORS CUSTOMER-INSTALLED
NOTE: METER BASE/SOCKET MUST BE GROUNDED PER NEC.
LINE LUG LINE LUG BYPASS STUDS BYPASS STUDS
LOAD LUG LOAD LUG
NEUTRAL BLOCK
CUSTOMER WIRES
NOTE: Line lugs shall be turned 180˚ to allow proper insertion of wire and to keep from blocking bypass area.
Figure 28 Typical arrangement of service conductors for 120/208 V three-phase self-contained 200 A service
SERVICE ENTRANCE CONDUCTORS CUSTOMER-INSTALLED
BYPASS BLOCK
CUSTOMER WIRES
LOAD
NOTE: Service wires shall be installed behind bypass block so operation of bypass is not restricted. NOTE: In three-phase delta 120/240 V services, the high leg shall be only on the right side of the meter base.
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Self-contained meter base/socket requirements
Single-phase A manual block bypass is required on all commercial services. Automatic circuit services: 400 A closures, sliders, and lever bypasses are not acceptable. or less
Single-phase A self-contained meter base/socket shall be installed on all new and remodeled single- services: phase services (120/240 V), where the current-carrying capacity of the service entrance 120/240 V, conductors does not exceed 200 A, as specified in NEC (see Table 8, Meter Base/ 200 A or less Socket Configuration A).
Single-phase Two options are available: services: 201 to 1. A self-contained 320-A meter base/socket with a manual block bypass is required 400 A on all new and remodeled single-phase services (120/240 V) over 200 A, where the current-carrying capacity of the service entrance conductors does not exceed 400 A, as specified in the NEC (see Table 8, Meter Base/Socket Configuration A). 2. Current transformer metering is available at additional cost; contact PSE’s CCS office (see Table 8, Meter Base/Socket Configuration B).
Single-phase A 5-terminal meter safety socket shall be installed where the fifth terminal is placed in services: the nine o’clock position connected to the socket neutral bus conductor (see Table 8, 120/208 V, Meter Base/Socket Configuration C). 200 A or less
Single-phase A 5-terminal meter safety socket shall be installed where the fifth terminal is placed in streetlight the nine o’clock position connected to the socket neutral bus conductor (see Table 8, services: Meter Base/Socket Configuration C). Flat rated services do not require a meter safety 120/240 V or socket. 240/480 V NOTE: All 240/480 V services require an accessible disconnect ahead of the meter. pedestals A fused disconnect is preferred.
Meter/panel For overhead service, meter/panel combo units must meet the requirements in combo units Chapter 3. For underground service, these units must meet the requirements Chapter 2, unless the line side conductors terminate below the meter base. If line side conductors terminate below the meter base and are bussed up to the top jaws, the minimum dimension for width and height is no longer required. NOTE: If using this type of service equipment, please check with your local or municipal inspector to determine if it meets updated NEC 2020 codes for disconnects. PSE requires this type of equipment to be hot sequenced and does not allow a disconnect ahead of the meter socket.
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Three-phase services: 200 A or less
All three-phase A manual block bypass is required on all commercial services. Automatic circuit services closures, sliders, and lever bypasses are not acceptable. The neutral (grounded conductor) shall be connected or tapped to the third terminal from the left on the lower terminals (see Table 8, Meter Base/Socket Configuration D).
Three-phase In addition to the requirements for all three-phase services, the high-leg (power leg) shall services: be connected through the right-hand terminals of the socket. 120/240 V, four-wire delta (Restricted — available only for existing services)
Three-phase An accessible disconnect (fused disconnect preferred) ahead of each meter base/ services: socket and a safety socket with a manual bypass are required. Disconnect must be 277/480 V co-located within 5 feet of the meter. NOTE: Be familiar and comply with the customer equipment restrictions provided in Section 1, Other customer responsibilities of this chapter.
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Table 8 Single-phase (nonresidential only) and all three-phase meter base/socket types
Voltage Wires Service No. of Meter Manual Accessible Socket Capacity Terminals Socket Block Disconnect Amp Config.* Bypass Ahead & Safety Required? Socket Required?
Single-Phase Nonresidential 120/240 3 up to 200 4 A Yes No Self-contained socket 120/240 3 201 to 320 4 A Yes No Self-contained 320 A socket 120/240 3 above 320 6 B n/a n/a Instrument transformer rated with provision for test switch 120/208 3 up to 200 5 C Yes No Preferred arrangement 120/240 3 up to 200 5 C Yes Safety socket Streetlight allowed but not applications only required 240/480 3 up to 200 5 C Yes Yes - fused Streetlight disconnect applications only preferred All Three-Phase 120/208 4 up to 200 7 D Yes No Self-contained socket 120/208 4 above 200 13 E n/a n/a Instrument transformer rated with provision for test switch 120/240 4 up to 200 7 D Yes No Self-contained socket (RESTRICTED APPLICATION) — High leg on right terminals 120/240 4 above 200 13 E n/a n/a Instrument transformer rated with provision for test switch (RESTRICTED APPLICATION) 277/480 4 up to 200 7 D Yes Yes - fused Self-contained disconnect safety socket preferred 277/480 4 above 200 13 E n/a n/a Instrument transformer rated with provision for test switch * Meter Base/Socket Configurations
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Section 3: Current transformer (CT) metering requirements (up to 800 A)
Single-phase services: over 400 A and three-phase services: over 200 A
Puget Sound Energy’s installation responsibilities PSE is responsible to provide and install: • Instrument transformers • Meters and test switches • Metering circuits (wiring)
Customer’s installation responsibilities Provisions for current transformers shall be made when the current-carrying capacity of the service entrance conductors exceeds 400 A single-phase or 200 A three-phase, as determined by the NEC.
Meter base/ You are responsible to provide and install the meter base/socket. socket
Sequencing All CT rated services shall have the meter ahead of any disconnect switches.
Metering circuit You are responsible to provide and install the metering circuit conduit. Metallic conduit conduit (EMT or Rigid) or Schedule 80 PVC conduit is required between the meter base/socket and CT enclosure. • The conduit shall be sized as follows: » Single-phase: 1 inch minimum » Three-phase: 1-1/4 inches minimum • Conduit shall be as short as possible and shall not exceed 50 feet in length or 360 degrees in bends. • A pull string is required in any meter conduit over 25 feet. • When metallic conduit (EMT or Rigid) is used, grounding bushings shall be used at both ends. • Conduit shall run from the CT enclosure and enter the test switch portion of the meter base/socket. NOTE: Metering circuit conduit shall not contain LB joints, condulets, junction boxes, or flex conduit. The preferred method of installing conduits entering the CT enclosure is shown in Figure 28.
Approval Manufacturers drawings shall be submitted for all CT enclosures prior to shipment from drawings the manufacturer. One set of drawings shall be sent directly to PSE’s Meter Engineering required for their required approval.
Location CT enclosures must be located in non-traffic areas where PSE Meter Journeymen can requirements work safely. Additional location requirements are found in this chapter.
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Figure 29 Preferred method of conduit installation in a single-phase and three-phase CT enclosure
SINGLE-PHASE INSTALLATION THREE-PHASE INSTALLATION
NO CONDUIT NO CONDUIT IN THIS AREA IN THIS AREA
LOAD LOAD
LINE LINE
CT enclosure You are responsible to provide and install a CT enclosure (see Table 9) ahead of the main disconnect on the outside of the structure, or in an approved electrical room (see Electrical room requirements section of this chapter). • Enclosures shall not be mounted in crawl spaces, attics, any confined areas, or mounted on ceilings. • The CT enclosures require a minimum front clearance of 36 inches. • Hinged CT enclosure doors shall not block a safe exit while open. • The top of the CT enclosure shall be a maximum of 8 feet above the floor or finished grade; the bottom shall be a minimum of 6 inches above the floor/grade. • The CT enclosure shall not be used as a junction box or bus gutter. • The CT enclosure covers shall not open vertically. Covers shall open horizontally, right to left, or double hinged on right and left (split door). • The CT enclosure must be the NEMA 3R outdoor type. • The CT enclosure requires a side wall clearance or other obstruction clearance of 2 inches. • The CT enclosure must be lockable.
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Table 9 CT enclosure dimensions (minimum)
Switch No. of Phase Width Height Depth Ampacity Transformers 1 * 401-800 2 24" 48" 11" 3 * 201-800 3 36" 48" 11" 3 ** Over 800 3 ** — — * Enclosure with a side-opening single-hinged door is required when cabinet dimensions are greater than 24" x 48". ** Services over 800 A require a switchboard designed to EUSERC specifications. Refer to the Remote Metering section in this chapter for more information. Services from 201-800 A may be switchboard designed to EUSERC specifications. Drawing must be submitted to PSE’s Meter Engineering.
Mounting the CT You are responsible to do the following: • Install a CT mounting base on services of 800 A or less (see Figures 29 and 30). • Provide and install two bolt lugs on the line and load sides of each phase and the neutral bus. NOTE: An instrument transformer enclosure shall contain only the main service conductors. Two types of current transformer brackets are available for terminating main service conductors: bolted lug and molded connector type. • Bolted current transformer mounting brackets allow two main service conductor connections per current transformer bracket. Current transformer brackets with molded connector blocks allow up to: » Three main service conductor connections per bracket when individual connector blocks are used. » Six main service conductor connections per bracket when stackable connector blocks are used. A gutter or junction box is required if there are more than six main service conductors. • All new CT brackets or rebuilt CT enclosures shall be 50 kA fault current rated.
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Figure 30 Single-phase CT mounting base bracket. EUSERC 328A (shown) or 328B
CT MOUNTING BOLTS TYPICAL 4 PLACES - 3/4" 5" SEE NOTE 3
1-3/4"
1-3/8" " " 7/8" 1-1/2 1-1/2
N
8-1/8" 10-32 MACHINE SCREW & WASHER DRILLED AND TAPPED INTO BUS
1-3/8" 1-3/4"
3/4" 8" MIN BUS MARKING “CT” (TYPICAL 2 PLACES) CABLE TERM. BOLTS (TYPICAL 4 PLACES - SEE NOTE 3)
INSULATING SUPPORT (SEE NOTE 1)
2" MIN 1/4" 2-1/2" MAX
3-1/2"
INSULATING BARRIER
NOTES: 1. Insulated supports shall be rated for the serving voltage and have sufficient mechanical strength for the application. 2. Mounting base accepts bar-type current transformers only. 3. Two 1/2 inch steel bolts shall be provided for each cable terminating position and each bolt shall be furnished with a spring washer and a nut. The spring washer may be either a cone-type (belleville) or a split-ring washer and a flat washer. Bolts shall be secured in place and spaced as shown. All parts shall be plated to prevent corrosion.
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Figure 31 Three-phase CT mounting base bracket. EUSERC 329A (shown) or 329B
3/4" CT MOUNTING BOLTS 5" TYPICAL 6 PLACES - SEE NOTE 3
1-3/4"
1-3/8" " " 7/8" 1-1/2 1-1/2
N
10-32 MACHINE 8-1/8" SCREW & WASHER DRILLED AND TAPPED INTO BUS
1-3/8" 1-3/4"
3/4" 7" MIN 7" MIN BUS MARKING “CT” CABLE TERM. BOLTS (TYPICAL 3 PLACES) (TYPICAL 6 PLACES - SEE NOTE 3)
INSULATING SUPPORT (SEE NOTE 1)
2" MIN 1/4" 2-1/2" MAX
3-1/2"
INSULATING BARRIER
NOTES: 1. Insulated supports shall be rated for the serving voltage and have sufficient mechanical strength for the application. 2. Mounting base accepts bar-type current transformers only. 3. Two 1/2 in. steel bolts shall be provided for each cable terminating position and each bolt shall be furnished with a spring washer and a nut. The spring washer may be either a cone-type (belleville) or a split-ring washer and a flat washer. Bolts shall be secured in place and spaced as shown. All parts shall be plated to prevent corrosion.
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Customer requirements for switchboard metering (over 800 A) A custom-built switchboard constructed to Equipment Utility Service Requirements Committee (EUSERC) specifications is required for services over 800 A. Switchboard metering may be used on services from 201-800 A, at your discretion.
Approval Approval drawings shall be submitted for all switchboard metering prior to shipment drawings from the manufacturer. One set of drawings shall be sent directly to the PSE Meter required Engineering for their required approval.
Installing current PSE will supply the CTs to be installed by your electrician in the CT section of your transformers switchboard for services larger than 800 A. Coordinate with your Project Manager to arrange for delivery of the CTs.
Three-phase Three-phase services require 13-terminal meter bases/sockets mounted on the services switchboard according to EUSERC 332 (see Figure 33, Diagram B), or mounted remotely and connected with approved conduit. The conduit shall terminate in the CT compartment and the test switch portion of the meter base/socket (see Figure 33).
Figure 32 Options for switchboard meters
13-TERMINAL 13-TERMINAL METER BASE/SOCKET METER BASE/SOCKET SURFACE-MOUNTED TO FACE OF REMOTELY MOUNTED SWITCHBOARD PANEL
EUSERC 332 4' MIN CONFIGURATION 6' MAX
Figure 33 Instrument-rated CT meter bases/sockets
DIAGRAM A DIAGRAM B 120/240 V SINGLE-PHASE METER BASE/SOCKET THREE-PHASE SINGLE METER BASE/SOCKET
9" 9"
20" 20" MIN MIN
1 TO CT CAN 1 11" TO CT CAN 11" TEST SWITCH TEST SWITCH SPACE SPACE
4" MIN 4-1/2" MIN 1" MIN 1-1/4" MIN 12" CONDUIT DIAMETER CONDUIT MIN 12" DIAMETER
1 DIAGRAM B: NOTE : 120/208 V, 4-WIRE WYE NO MORE THAN FOUR 90˚ BENDS 277/480 V, 4-WIRE WYE 50 FEET MAX LENGTH 120/240 V, 4-WIRE DELTA NO CONDULETS IN THE RUN ALL DIMENSIONS ARE MINIMUM
Electric Service Handbook 2021 — Non-residential Projects 56 Chapter 5
Customer generation
This chapter provides PSE’s requirements to interconnect and operate customer-owned and installed generation sources in parallel with PSE’s electric distribution system. Customer generation sources include fuel cell, hydroelectric, biomass, solar, or wind power generators. Customer generation does not include emergency power generators.
Responsibilities
Puget Sound PSE will review all interconnection applications, and once approved, will issue Approval Energy to Construct. PSE will provide and install net and production meters as requested.
Customer The customer shall submit an application to interconnect ahead of construction. Failure to obtain approval ahead of construction may result in delays and unanticipated costs for any corrections necessary. All customer electrical equipment shall comply with the NEC and any state or local code requirements.
General requirements Customer generation systems up to 100 kW may be connected to and operate in parallel to PSE’s facilities in accordance with Electric Tariff G, Schedule 150, Net Metering Service for Renewable Energy Systems and Schedule 152, Interconnection with Electric Generators. For systems larger than 100 kW and/or systems using a technology other than inverter-based renewable energy generators, please contact [email protected]. The design of these systems shall meet PSE’s standards for voltage flicker and harmonics and will be served by PSE at a standard service voltage (see Chapter 1, Table 1).
What to submit when applying for interconnection Customers must submit a signed Interconnection Application (including system diagram) using PowerClerk, our online application portal at psenetmetering.powerclerk.com.
Electric Service Handbook 2021 — Non-residential Projects 57 Chapter 5
Interconnection system diagrams For PSE to review the interconnection application, a one-line diagram must be included. The one-line diagram shall schematically represent the following equipment and electrical connectivity: • Battery bank (as applicable) • Disconnect switch (as applicable) • Generator • Inverter • Main electrical panel • Production meter (as applicable) • Service meter (net meter) • Sub panel (as applicable for battery backup) • Utility service point of connection A system diagram guide can be found at pse.com/netmetering.
Meter location Net meters and production meters are subject to the meter location requirements defined in Chapter 4 of this handbook. Production meters are optional. When a production meter is requested, it must be shown on the system diagram and noted on the Interconnection Application. A single production meter must be able to accurately measure all and only energy produced by the generating system and must be located adjacent to the net meter. “Adjacent” is defined as between 10 inches to 6 feet center-to-center along the same wall. Installers shall not round corners. Production metering for an expansion of a Generating Facility (defined as all generation behind a single net meter) will be reviewed on a case-by-case basis. The priority is for “all or none” of a generating facility’s energy output to be measured. More information about why a customer may want production meters can be found at pse.com/netmetering.
Meter socket requirements When an optional production meter is requested, the customer shall provide and install the meter socket. Customer-provided metering equipment shall meet the requirements stated in Chapter 4 of this handbook. Production meter sockets shall not be “jumpered” prior to PSE’s installation of the meter. Customers may not tap at or in a meter socket except for 320-amp service. For 320-amp service, customer may not create new lugs, modify existing lugs, or tap into bypass lugs.
Electric Service Handbook 2021 — Non-residential Projects 58 Chapter 5
Labeling requirements The labeling requirements in Chapter 4 of this handbook apply to net and production metering enclosures. In addition to those requirements, meter enclosures shall be labeled with permanently affixed signage at the production meter and net meter enclosures to identify their function (i.e., net meter or production meter). Where metering is accomplished at different voltages, the signage must also identify the voltages at which the meters are energized. Labels shall conform to the requirements of NEC Article 690. All labeling should be capitalized. PSE requires engraved phenolic nameplates or adhesive die-cut labels at least 1 inch high, with raised or cut-out lettering that is a minimum of 3/8 inch high.
Disconnect switch requirements PSE must have the ability to disconnect customer generation from PSE’s system for employee protection. A visible, lockable disconnect switch is recommended to be installed for all customer generation systems, and is required in some cases. A visible, lockable disconnect switch is required in any of the following scenarios: • Maximum generating capacity is greater than 25 kW ac. • Electric service is three-phase. • Electric service is CT-metered. A disconnect switch is optional if your system meets all of the following characteristics: • Maximum generating capacity is 25 kW ac or less. • Electric service is single-phase. • Electric service is self-contained. When a visible, lockable disconnect switch is required, it must be a single switch that isolates the entire generating system and is colocated with the electric service (net) meter. When the generation system includes optional production metering, the placement of the disconnect switch relative to the production meter shall be as follows: • For 240 V and 120/208 V self-contained and CT-rated production meters, the disconnect switch shall be connected to the Line side of the production meter (between the production meter and the inverter). • In the case of 480 V self-contained production meters, the disconnect switch shall be connected to the Load side of the production meter (between the production meter and electrical panel).
Electric Service Handbook 2021 — Non-residential Projects 59 Chapter 5
Commissioning The customer must leave the customer generation system OFF until PSE commissions and installs the net meter. Systems that include optional production metering shall be left on at the disconnect switch with the PSE production meter socket empty. The system is expected to turn on for testing when PSE installs the production meter. For systems without a production meter, the following applies: • Systems with a visible/accessible ac disconnect switch: The system must be left off at the ac disconnect switch after the electrical inspection. The system will be turned on by PSE when the net meter is installed. • Systems without an accessible ac disconnect switch: The system must be left off at the breaker after the electrical inspection. PSE will make an appointment with customer to coordinate installation of net meter commissioning.
Resources Additional information about interconnection and net metering with PSE (including Rate Schedules 150 and 152, details about the state and federal incentives, and system diagram guides) can be found at pse.com/netmetering.
Electric Service Handbook 2021 — Non-residential Projects 60 Chapter 6
Temporary services
What this In this chapter you will find answers to questions such as: chapter • What are the installation requirements for underground and overhead service? contains • What are the trenching requirements? • How do I locate existing underground utilities before I dig? • How do I get my temporary service energized?
Three-phase If you require three-phase temporary service, your Project Manager will contact temporary PSE’s Meter Department. service
Definition
A temporary (temp) service is a means of supplying electricity to your site for less than one year. Typically, a temp service provides power for the construction phase of your project, while provisions are being made for your permanent power system. Temp service is provided underground or overhead depending on available PSE facilities.
Obtaining your temporary service from existing power facilities
The following information applies to your temp service installation: • Determine if you need overhead or underground service. • Obtain an electrical work permit. • Order underground utility locate service by contacting the 811 “Call Before You Dig” hotline minimum two business days before digging. • Prepare the job site and install your temp service equipment (service post, pedestal, and meter base). • Obtain an electrical inspection approval of your temp service equipment (this is done by you or your contractor). • Call PSE to request that your temp service be connected and energized after your electrical inspection is complete. • Apply for permanent service. • At your request, we will check your site to determine if engineering is required.
If you have any questions, please call Customer Construction Services (CCS) at 1-888-321-7779
Electric Service Handbook 2021 — Non-residential Projects 61 Chapter 6
Scheduling
Most temp services are connected to existing power facilities and engineering is not required. In these cases temp services are typically energized 3 to 5 days after your installation has passed inspection. Depending on complexity and work volume, time frames will vary.
Customer charge for service
Charges vary due to the type of system we have in your area. Your CCS Representative will explain current temp service fees.
Temporary meter base/socket requirements
You are required to provide a meter socket with the following specifications: • A ring-type socket that includes a screw-type, stainless steel, or aluminum meter ring (snap-type rings must be stainless steel). • Rated 120/240 V • Single-phase • Minimum rating of 100 A • Maximum rating of 200 A • Four jaws • Underwriters Laboratory (UL) approved NOTE: A 120/208 V single-phase service requires a 5-terminal meter base with the fifth terminal tied to the neutral bus conductor. A 277/480 V three-phase service requires an accessible disconnect ahead of each meter socket and a safety socket with a manual bypass. If you would like a service of 201 A or greater, refer to the metering requirements in Chapter 4, Meter Installation, located in this handbook. All conductors necessary for standard service voltage, provided in Chapter 1, Table 1, must be determined
Temporary underground services
Temp underground service is available in PSE’s service area where the existing power facilities are installed underground. The process and cost of obtaining your temp underground service can vary, depending on the location of our existing facilities. If there is a power stubout, handhole, pedestal, or transformer located on your property, engineering may not be required. Simply install your temp service facilities (see Figure 34 and Figure 35), obtain an electrical inspection, and call PSE to connect your temp service.
Electric Service Handbook 2021 — Non-residential Projects 62 Chapter 6
Meter location To properly locate your temp meter pedestal, set the meter pedestal on your property no more than 5 feet from the transformer, stubout, handhole, or pedestal. If a distance greater than 5 feet is required, please contact a CCS Representative for approval prior to construction.
Trenching and It is the customer’s responsibility to provide the trenching needed to connect to a excavation power stubout (shown in Figure 34). The cable you provide is to be sized according requirements to the NEC and have a minimum 24 inches of backfill coverage. NOTE: A 4-foot-square excavation is required at the stubout to provide working room for our personnel to splice your cable to ours. If the connection point to PSE facilities is a handhole, pedestal, or transformer; trench up to the nearest side and leave your wires exposed. If you discover any other conductors while digging your trench, please leave them covered. If further trenching is required, our personnel will complete it. Remember to order underground utility locate service by contacting the 811 “Call Before You Dig” hotline minimum two business days before digging. NOTE: Any trenching within 24 inches of existing underground facilities must be done by hand.
Figure 34 Trenching requirements for power stubout
CUSTOMER POST, METER BASE, AND PANEL
6' MAX 4' MIN
PSE STUBOUT STUBOUT CONDUIT COVERING THE TEMPORARY CONNECTION 26" CUSTOMER OWNED TEMPORARY SERVICE CONDUCTORS
4' 4'
PSE CONDUCTOR
NOTE: 4' x 4' work pit required to allow working room for the tools necessary to connect temporary service
Electric Service Handbook 2021 — Non-residential Projects 63 Chapter 6
Underground The following items must be completed before energizing your underground temporary temp service: service 1. Contact a CCS Representative at 1-888-321-7779, and request your temp installation underground service. process 2. Obtain an electrical work permit from the inspecting agency. 3. Order underground utility locate service by contacting the 811 “Call Before You Dig” hotline two business days before digging. 4. Install your meter pedestal and meter base/socket in the appropriate location (see Figures 33 and 34). 5. Provide the appropriately sized conductor from your meter socket to PSE’s connection point. Please leave 5 feet of extra cable at the stubout or handhole, and 10 extra feet at a transformer. Consult the NEC for the appropriate cable sizes. 6. Obtain and pass an electrical inspection. 7. Trench up to and expose the PSE connection point at the stubout, handhole, or transformer. 8. If trenching is provided, cover your cable except in the work pit where our personnel will be splicing your cable to ours. 9. After the above items are complete, call CCS at 1-888-321-7779 and inform a CCS Representative that your installation has been inspected and that you are ready for your temp service. This installation shows a safe temp service. Do not deviate from the installation standards without approval from your CCS Representative. Doing so may extend the time frame for your service hookup. If service needs to be connected in right-of-way (ROW), a permit will be required. This can take several weeks.
Electric Service Handbook 2021 — Non-residential Projects 64 Chapter 6
Figure 35 Temporary underground service installation
1 TOP OF METER BASE SHALL NOT BE ABOVE TOP OF STRUCTURE 8
3
2
6' MAX 4' MIN
5' MAX 4
7 2' MIN COVER 3' MIN 5
6
Items owned and installed by customer Items owned and installed by PSE 1 4" x 4" x 10' continuous single structure Transformer, handhole, pedestal, or 7 stubout 2" x 4" bracing (post should be braced from 2 two directions) 8 Meter Meter socket and distribution panel (up to 3 200 A, 120/240 V) 4 Ground wire, in accordance with NEC/WAC 5 Ground rod, in accordance with NEC/WAC Service entrance conductors in accordance 6 with NEC
NOTE: Trench and backfill from meter base to transformer, handhole, pedestal, or stubout is customer provided.
Electric Service Handbook 2021 — Non-residential Projects 65 Chapter 6
Temporary overhead services Temp overhead service is available anywhere in PSE’s service area where the existing electrical system is installed overhead. The process and cost of obtaining your temp overhead service can vary depending on the location of our existing facilities. The least complicated and cheapest way a temp service can be installed is if a transformer is located on a pole alongside your property. If this is the case, engineering may not be required. All you have to do is install your temp service equipment, have it inspected, and call Customer Construction Services (CCS) at 1-888-321-7779 to order your service. Once the above items are completed, your service will be connected within a few business days.
Meter location Your temp meter post should be located on your property and within 70 feet of the PSE pole that will serve you. This limitation ensures that your temp service pole can withstand the weight of the conductor. If a distance greater than 70 feet is required, or if PSE’s pole is on the opposite side of the street, please call CCS for approval prior to construction. A taller, stouter post with additional bracing could be required.
Service line path In addition to the meter post distance limitation mentioned above, the service line path requirements requirements are: • The path that the service line will take should not cross property belonging to other individuals. • If the service line will pass through trees or brush, clear a path to allow our service personnel to run the line and to allow the lines to hang without contacting trees or limbs. Maintaining this clear path is the customer’s responsibility. • The service line path should avoid areas where vehicular traffic will occur, unless your temp service post height is increased to provide adequate clearance (see Figure 36).
Clearance The National Electric Code (NEC) and the National Electric Safety Code (NESC) have requirements established minimum clearance requirements to maintain safe heights for electrical conductors over various terrains. Figure 36 shows the clearance requirements for the types of terrain most commonly encountered. The NEC and NESC require the lowest point of a service conductor to be at least 12 feet aboveground. The bottom of the drip loop must be a minimum of 10 feet above the ground. You are required to provide a point of attachment on your service pole that will allow PSE to install the conductor and maintain the required clearances. If you need further details, please consult the current issue of the NEC, or contact the state or local electrical inspector for your area.
Electric Service Handbook 2021 — Non-residential Projects 66 Chapter 6
Figure 36 Minimum clearance requirements upon installation
70' MAXIMUM
SERVICE LINE (UTILITY OWNED)
TEMPORARY SERVICE 26' MIN
18' MIN 16' MIN 12' MIN 10' MIN
STATE HIGHWAYS STREETS, ALLEYS, DRIVEWAYS, AND NON-TRAFFIC COUNTY ROADS PARKING AREAS PROPERTY
Overhead The following items must be completed before we can energize your service: temporary 1. Contact a CCS Representative and request your temporary overhead service. service installation 2. Obtain an electrical work permit from the inspecting agency. process 3. Install a meter pole and meter socket. Temporary service equipment on trees is not acceptable. 4. Obtain and pass an electrical inspection. 5. After these items are completed, call CCS and inform a CCS Representative that your installation has been inspected and that you are ready for temp service. Figure 37 shows a typical temp overhead service installation. Consult with your CCS representative for non-typical installations.
Electric Service Handbook 2021 — Non-residential Projects 67 Chapter 6
Figure 37 Temporary overhead service installation
8 6
TOP VIEW OF STUD AND BRACES ALIGN SERVICE LINE BETWEEN BRACES. MAX 70' IN LENGTH WITHOUT PSE APPROVAL. 7
1 45˚
2
10' MIN 9 TO DRIP LOOP
12' 3 MIN NOTE THAT THE SERVICE LINES 6' MAX EXTEND AT A 45˚ ANGLE FROM WITHIN 4' MIN THE BRACES
4 5
GROUND LINE 24" MIN
8' MIN
Items owned and installed by customer Items owned and installed by PSE 4" x 4" x 16' or 2" x 10" x 16' minimum, 8 Service line 1 continuous single structure. No timber 9 Meter Meter socket and distribution panel (up to 2 200 A, 120/240 V) 3 Ground wire, in accordance with NEC/WAC 4 Ground rod, in accordance with NEC/WAC 5 2" x 4" brace (two required) Service entrance conductors - 18" out of 6 weatherhead minimum 7 Insulated clevis (point of attachment)
Electric Service Handbook 2021 — Non-residential Projects 68 Glossary
Clearance – A set distance between two objects. Conduit – A listed or approved wireway with a smooth interior surface to permit easy drawing-in of the electrical conductors. A conduit may be metallic or nonmetallic, depending on its usage, in accordance with codes and Puget Sound Energy Standards. Corrosion Inhibitor – Electrical joint compound used to retard oxidation of electrical connections. Customer Generation – A generation facility installed by PSE customers that are interconnected and operated in parallel with PSE’s electric distribution system through the electric service meter (net meter). Demand – The maximum average kilowatt load used by the customer for a specific period of time during the billing period. Direct Burial – The installation of electrical conductors in a trench, without the use of conduit. Disconnect Switch – A single blade-type, visible and lockable disconnect. EUSERC – Electrical Utility Service Equipment Requirements Committee Ground Mount – A generation installation supported by its own independent structure. Guard Post – A bollard or post designed to protect the meter installation or transformer from vehicular traffic. Guying – Cables or braces used to relieve the strain of overhead conductors on masts and poles. High Leg – (Also wild leg, delta leg) The phase leg that is at higher potential to ground than any other two-phase legs. This leg shall be identified in red. High-rise Building – A structure meeting the definition set forth in the International Building Code. Instrument Transformer – Current and/or potential transformers used in connection with metering equipment to monitor high current loads and/or high voltage potentials. Inverter – An electronic device used to change dc current into ac current. Keybox or Keycards – Permanently installed, locked box with keys enclosed, or a keycard screening monitor mounted on the outside of a building, for accessing the customer’s premises to read, install, service, or remove Puget Sound Energy meters and/ or electrical equipment during reasonable working hours. Manual Block Bypass (Circuit-Closing Block) – A provision for paralleling the meter circuit, allowing the meter to be removed without interrupting service to the customer. Meter Jaw – A spring-loaded receptacle installed inside a meter socket, interfacing the terminals of the meter to the source and load conductors of the service. Meter Loop – Any provision in which an electrical meter may be installed. Does not include the service disconnect device. Meter Pole – A pole which supports the metering equipment owned and maintained by the customer. Meter Base/Socket – The mounting device consisting of meter jaws, connectors, and enclosure for accommodating socket-type meters. The mounting device may be either a single socket or a trough to accommodate more than one mounting unit. Multifamily Building – A single structure comprised of two or more independent dwelling units having permanent provisions for living, sleeping, cooking, and sanitation.
Electric Service Handbook 2021 — Non-residential Projects 69 Glossary
Municipal or State Inspector – The qualified representative of a city or the Washington State Department of Labor and Industries, who has been authorized by governmental agencies to inspect electrical service installations on their behalf. NEC – National Electrical Code Net Meter – A PSE meter through which the customer generation is interconnected to the PSE electric distribution system. Net meters measure both energy delivered from PSE to the customer and energy returned to PSE from the customer. Nonresidential Buildings – All structures that are not residential buildings or multifamily buildings, or where portions of such a building are intended for commercial, retail, or general public activities. Point of Attachment – The point at which Puget Sound Energy’s service conductors are attached to the customer’s premises by an approved insulated clevis. Point of Delivery – The location on the customer’s premises where Puget Sound Energy’s circuit and the customer’s system are interconnected. Primary Voltage – The higher voltage, before transformation, used to distribute electrical energy through neighborhoods and local areas. Normally in excess of 600 V. RCW – Revised Code of Washington Safety Socket – A three-phase self-contained meter base socket with provisions to de-energize the meter base without disconnecting the load. Seal – The locking device used to secure meter and/or service entrance equipment to ensure safety and security for the unit. Secondary Voltage – The lower voltage, after transformation, used to supply the customer with electrical energy. Normally less than 600 V. Self-Contained – In reference to meter sockets: a device designed and rated to continuously carry the entire capacity of the service entrance equipment through the meter. Service Entrance Conductors – Those conductors which extend between the customer’s load center and point of delivery. Service Entrance Equipment – Service conduit, conductors, weatherhead, meter base, enclosures, service disconnect, and load center. Service Mast – The conduit above the meter used to provide mechanical protection for the service conductors and to support the service drop from PSE’s system. Supply Side Tap – A connection that is made on the line or utility side of the main service disconnect breaker. Temporary Service – An electrical service installed by Puget Sound Energy to provide power to a customer on a temporary basis (12 months or less). WAC – Washington Administrative Code
Electric Service Handbook 2021 — Non-residential Projects 70 Notes
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